CN220128244U

CN220128244U - Screw rod lifting device and processing equipment for machine tool

Info

Publication number: CN220128244U
Application number: CN202321180310.7U
Authority: CN
Inventors: 杨兴发; 杨银; 汪壮; 喻宇福; 文桂林; 周兴旺
Original assignee: Changsha Sugong Technology Co ltd
Current assignee: Changsha Sugong Technology Co ltd
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-12-05
Anticipated expiration: 2033-05-16

Abstract

The utility model provides a screw rod lifting device and machining equipment for a machine tool, and relates to the technical field of machine tool equipment. The screw rod lifting device is supported below the transmission screw rod through the first lifting assembly and the second lifting assembly, the nut seat is arranged between the first lifting assembly and the second lifting assembly, and the nut seat can push the first lifting assembly or the second lifting assembly to move. Because the first lifting assembly and the second lifting assembly are connected through the adjusting connecting rod, when one of the first lifting assembly and the second lifting assembly is pushed to move by the nut seat, the other can synchronously move along with the first lifting assembly and the second lifting assembly, so that the supporting follow-up of the first lifting assembly and the second lifting assembly is realized, the stability of the processing device during moving is improved, the structure is simplified, and the failure rate is reduced. In addition, by adjusting the spacing between the first and second lift assemblies to more precisely match the processing device, stability in movement of the processing device is further provided.

Description

Screw rod lifting device and processing equipment for machine tool

Technical Field

The utility model relates to the technical field of machine tool equipment, in particular to a screw rod lifting device and machining equipment for a machine tool.

Background

With the continuous development of machine tool technology, a high-precision and long-stroke ball screw transmission structure is widely applied to a large-scale machine tool. However, the deflection of the overlong screw rod is increased, and the excellent transmission precision is difficult to ensure. In order to solve this problem without increasing the diameter of the screw and the assembly pretension, the prior art reduces the deflection in the operation of the elongated screw by adding auxiliary support in the screw drive.

However, the existing auxiliary supporting device is fixedly arranged on the base below the screw rod transmission assembly, if the screw rod spans too long, a plurality of auxiliary supporting devices are required to be arranged in cooperation with the length of the screw rod, so that the installation and debugging difficulty is high. In addition, the existing auxiliary supporting device needs to control the lifting of the auxiliary supporting device by arranging a plurality of position sensors and hydraulic cylinders so as to avoid the nut seat which reciprocates. Therefore, the structure of the existing auxiliary supporting device is complex, and if one auxiliary supporting device fails, the nut seat cannot pass smoothly, so that the screw rod transmission structure is damaged.

Disclosure of Invention

The utility model aims to provide a screw rod lifting device and processing equipment for a machine tool, which are used for solving the defects in the prior art.

To achieve the above object, in a first aspect, the present utility model provides a screw lifting device applied to a machining apparatus for a machine tool, the screw lifting device comprising:

a long base for setting a machining device of the machine tool machining equipment;

the screw rod transmission mechanism is arranged on the long base and used for driving the processing device to slide along the length direction of the long base, and comprises a transmission screw rod arranged along the length direction of the long base, and a nut seat connected with the processing device is arranged on the transmission screw rod; and

the lifting mechanism comprises a first lifting assembly, a second lifting assembly, an adjusting connecting rod and a first sliding rail, wherein the first sliding rail is arranged on the long base, the first sliding rail extends along the length direction of the long base, the first lifting assembly and the second lifting assembly are both arranged on the first sliding rail in a sliding manner, and the adjusting connecting rod is connected with the first lifting assembly and the second lifting assembly and is used for adjusting the distance between the first lifting assembly and the second lifting assembly;

the first lifting assembly and the second lifting assembly are supported below the outer cylindrical surface of the transmission screw rod, the nut seat is arranged between the first lifting assembly and the second lifting assembly, and the nut seat is used for pushing the first lifting assembly or the second lifting assembly to move.

As a further improvement of the above technical scheme:

with reference to the first aspect, in one possible implementation manner, two ends of the adjusting link are provided with threaded rod segments, the threaded rod segments penetrate through the corresponding first lifting component or the corresponding second lifting component, and two adjusting nuts are arranged on the threaded rod segments and are used for clamping the corresponding first lifting component or the corresponding second lifting component.

With reference to the first aspect, in one possible implementation manner, the adjusting link includes a link sleeve and two threaded heads, two threaded heads are adjustably disposed in the threaded holes, and the two threaded heads are respectively connected with the first lifting component or the second lifting component at the corresponding ends.

With reference to the first aspect, in one possible implementation manner, two adjusting links are provided, and two adjusting links are located at two sides of the first sliding rail.

With reference to the first aspect, in one possible implementation manner, the first lifting assembly and the second lifting assembly each include:

the mounting seat is arranged on the first sliding rail in a sliding way through a first sliding block; and

the supporting piece is detachably arranged on the mounting seat, and the upper surface of the supporting piece is in butt joint with the outer cylindrical surface of the transmission screw rod.

With reference to the first aspect, in one possible implementation manner, the support member is in line contact, surface contact or point contact with an outer cylindrical surface of the driving screw.

With reference to the first aspect, in one possible implementation manner, an arc-shaped curved surface groove matched with the outer cylindrical surface of the transmission screw rod is concavely formed on the upper surface of the supporting piece.

With reference to the first aspect, in a possible implementation manner, two rotatable roller shafts are arranged on the support member, the two roller shafts are arranged on two sides of the transmission screw rod, and the axis of each roller shaft is parallel to the axis of the transmission screw rod;

the included angle between the axes of the two roll shafts and the perpendicular line of the axis of the transmission screw rod is an acute angle.

With reference to the first aspect, in one possible implementation manner, a plurality of elastic supporting heads are disposed on the upper surface of the supporting piece along the length direction of the long base, a distance between two adjacent elastic supporting heads is adapted to a pitch of the transmission screw rod, and an end surface of the elastic supporting head, which abuts against the transmission screw rod, is a spherical segment surface.

In order to achieve the above object, in a second aspect, the present utility model further provides a machining apparatus for a machine tool, including a machining device and a screw lifting device provided according to the above first aspect;

the long base is provided with a second sliding rail, the bottom of the processing device is provided with a second sliding block which is in sliding fit with the second sliding rail, and the processing device is used for surface processing or hole processing.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model provides a screw rod lifting device and processing equipment for a machine tool, wherein the screw rod lifting device is supported below a transmission screw rod through a first lifting assembly and a second lifting assembly, a nut seat is arranged between the first lifting assembly and the second lifting assembly, and the nut seat can push the first lifting assembly or the second lifting assembly to move. The first lifting assembly and the second lifting assembly are connected through the adjusting connecting rod, so that when one of the first lifting assembly and the second lifting assembly is pushed to move, the other one of the first lifting assembly and the second lifting assembly can synchronously move, the nut seat is always ensured to be in the supporting range of the first lifting assembly and the second lifting assembly, the supporting follow-up of the first lifting assembly and the second lifting assembly is realized, the stability of the machining device during movement is improved, the structure is simplified, and the failure rate is reduced.

Further, because the adjusting connecting rod can adjust the distance between the first lifting assembly and the second lifting assembly, when the processing device is debugged on site, the distance between the first lifting assembly and the second lifting assembly can be more accurately matched with the processing device according to actual requirements, and the stability of the processing device during movement is further provided.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate only certain embodiments of the utility model and, therefore, should not be considered as limiting the scope, since it is possible to obtain other related drawings from the drawings without inventive step by those of ordinary skill in the art. In the drawings:

fig. 1 is a schematic perspective view showing a machining apparatus for a machine tool according to an embodiment of the present utility model;

fig. 2 shows a schematic perspective view of a supporting and driving screw of a lifting mechanism in a screw rod lifting device according to an embodiment of the present utility model;

fig. 3 is a schematic view showing a partial structure of a first lifting mechanism according to an embodiment of the present utility model;

fig. 4 is a schematic view showing a partial structure of a second lifting mechanism according to an embodiment of the present utility model;

fig. 5 is a schematic view showing a partial structure of a third lifting mechanism according to an embodiment of the present utility model;

fig. 6 is a schematic diagram showing a partial structure of a fourth lifting mechanism according to an embodiment of the present utility model.

Reference numerals illustrate:

100. a long base;

200. a screw rod transmission mechanism; 210. a drive assembly; 220. a transmission screw rod; 230. a nut seat; 240. a bearing seat;

300. a lifting mechanism; 310. a first lifting assembly; 311. a mounting base; 312. a support; 312a, swing arms; 313. an arc-shaped curved surface groove; 314. an elastic support head; 315. a roll shaft; 316. a tension spring; 320. a second lifting assembly; 330. adjusting the connecting rod; 331. a threaded rod section; 332. an adjusting nut; 333. a connecting rod sleeve; 334. a threaded rod head; 340. a first slide rail;

400. a second slide rail;

500. a processing device; 510. a vertical frame; 520. a first machining drive mechanism; 530. a second machining drive mechanism; 540. a processing execution unit; 550. a third slide rail; 560. a third slider;

x, a first horizontal direction; y, the second horizontal direction; z, vertical direction.

Detailed Description

The following describes the detailed implementation of the embodiments of the present utility model with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the embodiments of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model will be described in detail below with reference to the drawings in connection with exemplary embodiments.

Examples

Referring to fig. 1 and 2, the present embodiment provides a screw lifting device, which is applied to a machine tool machining device, wherein the machine tool machining device includes a machining device 500, and the machining device 500 can be used for milling, drilling, boring and other machining operations.

The screw lifting device in this embodiment includes a long base 100, a screw transmission mechanism 200, and a lifting mechanism 300; wherein the long base 100 is arranged on a foundation or a table, and the long base 100 is used for providing a machining device 500 of a machining apparatus for a machine tool. In the present embodiment, the longitudinal direction of the long base 100 is defined as the first horizontal direction X.

The screw transmission mechanism 200 is disposed on the long base 100, the screw transmission mechanism 200 is connected to the processing device 500, and the screw transmission mechanism 200 is used for driving the processing device 500 to slide along the first horizontal direction X relative to the long base 100.

Further, the screw driving mechanism 200 includes a driving assembly 210, a driving screw 220 and a nut seat 230, the driving screw 220 is disposed on the long base 100, and the length direction of the driving screw 220 is parallel to the first horizontal direction X, and two ends of the driving screw 220 extend along the first horizontal direction X respectively. Both ends of the driving screw 220 are respectively disposed on bearing seats 240, and the bearing seats 240 are disposed on the long base 100, whereby the driving screw 220 can rotate around its own axis. The nut seat 230 is sleeved on the transmission screw rod 220, the nut seat 230 is matched with the transmission screw rod 220 in a threaded pair, and the nut seat 230 is also connected with the bottom of the processing device 500. The driving assembly 210 is disposed on the long base 100 and connected to one end of the transmission screw 220 through a mechanical transmission mechanism, and the driving assembly 210 is used for driving the transmission screw 220 to rotate, so that the nut seat 230 can drive the processing device 500 to slide back and forth along the first horizontal direction X relative to the long base 100 through the cooperation of the nut seat 230 and the transmission screw 220.

Alternatively, the drive assembly 210 may be a servo motor or a stepper motor. The mechanical transmission mechanism connected between the servo motor or the stepping motor and the transmission screw 220 can be selected from a gear transmission mechanism, a chain wheel transmission mechanism, a belt pulley transmission mechanism or a coupling.

The lifting mechanism 300 includes a first lifting assembly 310, a second lifting assembly 320, an adjusting link 330 and a first sliding rail 340, the first sliding rail 340 is disposed on the long base 100, and the first sliding rail 340 is disposed on the long base 100 and extends along a first horizontal direction X. The first lifting assembly 310 and the second lifting assembly 320 are both slidably disposed on the first sliding rail 340, and the adjusting link 330 is connected with the first lifting assembly 310 and the second lifting assembly 320, for adjusting a distance between the first lifting assembly 310 and the second lifting assembly 320.

The first lifting assembly 310 and the second lifting assembly 320 are supported below an outer cylindrical surface of the transmission screw 220, the nut seat 230 is interposed between the first lifting assembly 310 and the second lifting assembly 320, and the nut seat 230 is used for pushing the first lifting assembly 310 or the second lifting assembly 320 to move.

Compared to the prior art, in the screw rod lifting device provided in the present embodiment, since the nut seat 230 is interposed between the first lifting assembly 310 and the second lifting assembly 320, the nut seat 230 can push the first lifting assembly 310 or the second lifting assembly 320 to move. Because the first lifting component 310 and the second lifting component 320 are connected through the adjusting connecting rod 330, when one of the first lifting component 310 and the second lifting component 320 is pushed to move, the other one of the first lifting component 310 and the second lifting component 320 can also synchronously move, so that the nut seat 230 is always in the supporting range of the first lifting component 310 and the second lifting component 320, the supporting follow-up of the first lifting component 310 and the second lifting component 320 is realized, the stability of the processing device 500 during moving is improved, the structure is simplified, and the failure rate is reduced.

It is also understood that certain errors exist in the assembly of the machining device 500, and that assembly errors vary from one machining device 500 to another. Therefore, the distance between the first lifting component 310 and the second lifting component 320 is adjustable through the adjusting connecting rod 330, so that when the processing device 500 is debugged on site, the distance between the first lifting component 310 and the second lifting component 320 can be more accurately matched with the processing device 500 according to actual requirements, stability when the processing device 500 moves is further provided, and processing precision is improved.

Further, two adjusting links 330 are provided, and the two adjusting links 330 are located at two sides of the first sliding rail 340. By connecting the two adjusting links 330 to the first lifting assembly 310 or the second lifting assembly 320, the stability of the first lifting assembly 310 or the second lifting assembly 320 against the force applied when colliding with the nut seat 230 can be improved.

Referring to fig. 3, in the present embodiment, two ends of the adjusting link 330 are provided with threaded rod segments 331, the threaded rod segments 331 penetrate through the corresponding first lifting assembly 310 or second lifting assembly 320, and two adjusting nuts 332 are provided on the threaded rod segments 331, and the two adjusting nuts 332 are used for clamping the corresponding first lifting assembly 310 or second lifting assembly 320. When the distance between the first lifting assembly 310 and the second lifting assembly 320 needs to be adjusted, only the adjusting nuts 332 at the two ends of the first lifting assembly 310 or the second lifting assembly 320 need to be unscrewed, and when the exposed length of the adjusting connecting rod 330 between the first lifting assembly 310 and the second lifting assembly 320 reaches a preset value, the unscrewed adjusting nuts 332 are screwed to fix the threaded rod section 331.

Referring to fig. 4, in some embodiments, the adjusting link 330 includes a link sleeve 333 and two threaded heads 334, threaded holes are disposed at two ends of the link sleeve 333, the two threaded heads 334 are adjustably disposed in the threaded holes, and the two threaded heads 334 are respectively connected to the first lifting assembly 310 or the second lifting assembly 320 at corresponding ends. Thus, by rotating the link sleeve 333, the length of extension of the two threaded heads 334 can be adjusted, thereby adjusting the spacing between the first and second lift assemblies 310, 320.

Referring to fig. 2 and 3, in the present embodiment, the first lifting device 310 and the second lifting device 320 are configured in a uniform manner. Specifically, the first lifting assembly 310 and the second lifting assembly 320 each include a mounting seat 311 and a supporting member 312, and the mounting seat 311 is slidably disposed on the first sliding rail 340 through a first slider (not shown). The supporting member 312 is detachably disposed on the mounting seat 311, and an upper surface of the supporting member 312 abuts against an outer cylindrical surface of the driving screw 220. It will be appreciated that the support 312 is removably disposed to facilitate later replacement.

Further, the support 312 is in line contact, surface contact or point contact with the outer cylindrical surface of the drive screw 220.

In some embodiments, as shown in fig. 3, the upper surface of the support member 312 is concavely provided with an arc-shaped curved groove 313 adapted to the outer cylindrical surface of the driving screw 220, wherein the arc-shaped curved groove 313 is in surface contact with the driving screw 220.

Optionally, the support 312 is a piece of wear resistant material, preferably a piece of wear resistant nylon material.

Referring to fig. 5, in other embodiments, a plurality of elastic supporting heads 314 are disposed on the upper surface of the supporting member 312 along the length direction of the long base 100, the interval between two adjacent elastic supporting heads 314 is adapted to the pitch of the driving screw 220, and the end surface of the elastic supporting head 314 abutting against the driving screw 220 is a spherical segment surface. Thus, the facet is in point contact with the drive screw 220.

The elastic supporting head 314 comprises a mounting shell, a pushing head and a spring, wherein the pushing head and the spring are arranged in the mounting shell, the spring is used for driving the pushing head to extend out of the mounting shell, and the end face of the pushing head is a spherical segment face. Of course, in some embodiments, the elastic support head 314 may be replaced with a support cylinder that is screw-fitted with the support 312, whereby the height of the support cylinder protruding from the support 312 can be adjusted by screwing the support cylinder.

Optionally, an end surface of the elastic supporting head 314, which abuts against the transmission screw 220, is provided with a wear-resistant layer, and the wear-resistant layer is made of wear-resistant nylon materials.

Referring to fig. 6, in still other embodiments, two rotatable rollers 315 are provided on the support member 312, the two rollers 315 are disposed on two sides of the driving screw 220, and the axis of the rollers 315 is parallel to the axis of the driving screw 220. The included angle between the axes of the two rollers 315 and the perpendicular line of the axis of the driving screw 220 is an acute angle, so as to form a support for the driving screw 220, and meanwhile, the two rollers 315 arranged oppositely can be adapted to the driving screws 220 with different diameters.

Optionally, the outer peripheral surfaces of the two roller shafts 315 are sleeved with wear-resistant sleeves, and the wear-resistant sleeves are made of wear-resistant nylon materials.

Optionally, the supporting member 312 is two swing arms 312a movably hinged to the mounting seat 311, a tension spring 316 is disposed between the two roller shafts 315, and two ends of the tension spring 316 are respectively connected to the corresponding swing arms 312a. The tension spring 316 drives the two rollers 315 to move toward each other to ensure contact between the two rollers 315 and the driving screw 220, and the driving screws 220 with different diameters can be adapted.

Referring to fig. 1 to 6, further, the present embodiment also provides a machining apparatus for a machine tool. The machine tool machining apparatus includes the machining device 500 and the screw rod lifting device provided above.

The long base 100 is provided with a second sliding rail 400, a second sliding block in sliding fit with the second sliding rail 400 is arranged at the bottom of the processing device 500, and the processing device 500 is used for surface processing or hole processing.

Referring to fig. 1, a machining apparatus 500 includes a stand 510, a first machining driving mechanism 520, a second machining driving mechanism 530, and a machining executing unit 540. The stand 510 is slidably disposed on the second sliding rail 400 of the long base 100 through a second sliding block; the first process driving mechanism 520 is provided to the stand 510. The third sliding rail 550 is arranged on the vertical frame 510 along the vertical direction Z, the second processing driving mechanism 530 is slidably arranged on the third sliding rail 550 of the vertical frame 510 through the third sliding block 560, and the second processing driving mechanism 530 is connected with the first processing driving mechanism 520, and the first processing driving mechanism 520 is used for driving the second processing driving mechanism 530 to move along the vertical direction Z. The machining execution unit 540 is disposed in the second machining driving mechanism 530, and the second machining driving mechanism 530 is used for driving the machining execution unit 540 to move along a second horizontal direction Y, and the second horizontal direction Y is perpendicular to the first horizontal direction X, so that the feeding amount of the machining execution unit 540 during machining can be controlled by the second machining driving mechanism 530. It will be appreciated that the degree of freedom in movement of the machining execution unit 540 in the first horizontal direction X, the second horizontal direction Y, and the vertical direction Z is achieved by the cooperation of the first wire drive mechanism 200, the first machining drive mechanism 520, and the second machining drive mechanism 530. The machining execution unit 540 is used for clamping a tool for machining.

Optionally, the first and second machining drives 520, 530 each include a servo motor, a screw, and a nut.

The foregoing details of the optional implementation of the embodiment of the present utility model have been described in detail with reference to the accompanying drawings, but the embodiment of the present utility model is not limited to the specific details of the foregoing implementation, and various simple modifications may be made to the technical solution of the embodiment of the present utility model within the scope of the technical concept of the embodiment of the present utility model, and these simple modifications all fall within the protection scope of the embodiment of the present utility model.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

In addition, any combination of various embodiments of the present utility model may be performed, so long as the concept of the embodiments of the present utility model is not violated, and the disclosure of the embodiments of the present utility model should also be considered.

Claims

1. The utility model provides a lead screw lifting device, is applied to processing equipment for lathe, its characterized in that, lead screw lifting device includes:

a long base (100) for providing a machining device (500) of the machine tool machining apparatus;

the screw rod transmission mechanism (200) is arranged on the long base (100) and is used for driving the processing device (500) to slide along the length direction of the long base (100), the screw rod transmission mechanism (200) comprises a transmission screw rod (220) arranged along the length direction of the long base (100), and a nut seat (230) connected with the processing device (500) is arranged on the transmission screw rod (220); and

the lifting mechanism (300) comprises a first lifting assembly (310), a second lifting assembly (320), an adjusting connecting rod (330) and a first sliding rail (340), wherein the first sliding rail (340) is arranged on the long base (100), the first sliding rail (340) extends along the length direction of the long base (100), the first lifting assembly (310) and the second lifting assembly (320) are both arranged on the first sliding rail (340) in a sliding mode, and the adjusting connecting rod (330) is connected with the first lifting assembly (310) and the second lifting assembly (320) and is used for adjusting the distance between the first lifting assembly (310) and the second lifting assembly (320);

the first lifting assembly (310) and the second lifting assembly (320) are supported below the outer cylindrical surface of the transmission screw rod (220), the nut seat (230) is arranged between the first lifting assembly (310) and the second lifting assembly (320), and the nut seat (230) is used for pushing the first lifting assembly (310) or the second lifting assembly (320) to move.

2. Screw lifting device according to claim 1, characterized in that the two ends of the adjusting link (330) are provided with threaded rod segments (331), the threaded rod segments (331) penetrating the corresponding first lifting assembly (310) or second lifting assembly (320), the threaded rod segments (331) being provided with two adjusting nuts (332), the two adjusting nuts (332) being used for clamping the corresponding first lifting assembly (310) or second lifting assembly (320).

3. The screw lifting device according to claim 1, wherein the adjusting link (330) comprises a link sleeve (333) and two threaded heads (334), threaded holes are provided at both ends of the link sleeve (333), two threaded heads (334) are adjustably provided in the threaded holes, and two threaded heads (334) are respectively connected with the first lifting assembly (310) or the second lifting assembly (320) at the corresponding ends.

4. A screw lifting device according to any one of claims 1-3, characterized in that two of the adjusting links (330) are provided, two of the adjusting links (330) being arranged on both sides of the first slide rail (340).

5. The lead screw lift device of claim 1, wherein the first lift assembly (310) and the second lift assembly (320) each comprise:

the mounting seat (311) is arranged on the first sliding rail (340) in a sliding way through a first sliding block; and

the support piece (312) is detachably arranged on the mounting seat (311), and the upper surface of the support piece (312) is in contact with the outer cylindrical surface of the transmission screw rod (220).

6. The screw lift device according to claim 5, characterized in that the support (312) is in line contact, surface contact or point contact with the outer cylindrical surface of the drive screw (220).

7. The screw lifting device according to claim 5, wherein the upper surface of the support member (312) is provided with an arc-shaped curved surface groove (313) which is matched with the outer cylindrical surface of the transmission screw (220) in a downward concave manner.

8. The screw lifting device according to claim 5, characterized in that the support (312) is provided with two rotatable rollers (315), two rollers (315) being arranged on both sides of the transmission screw (220), the axis of the rollers (315) being parallel to the axis of the transmission screw (220);

the included angle between the axes of the two roll shafts (315) and the perpendicular line of the axis of the transmission screw rod (220) is an acute angle.

9. The screw lifting device according to claim 5, wherein a plurality of elastic supporting heads (314) are arranged on the upper surface of the supporting piece (312) along the length direction of the long base (100), the distance between two adjacent elastic supporting heads (314) is matched with the screw pitch of the transmission screw (220), and the end surface of the elastic supporting head (314) propped against the transmission screw (220) is a spherical segment surface.

10. A machining device for a machine tool, characterized by comprising a machining apparatus (500) and a screw lifting apparatus according to any one of claims 1-9;

the long base (100) is provided with a second sliding rail (400), the bottom of the processing device (500) is provided with a second sliding block which is in sliding fit with the second sliding rail (400), and the processing device (500) is used for surface processing or hole processing.