CN219336960U

CN219336960U - Gantry type machine tool and beam transmission mechanism thereof

Info

Publication number: CN219336960U
Application number: CN202320478449.3U
Authority: CN
Inventors: 张舟; 孟祥东; 张海新; 葛向阳; 张雅欣
Original assignee: Jiangsu Prudy Cnc Technology Co ltd
Current assignee: Jiangsu Prudy Cnc Technology Co ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-07-14
Anticipated expiration: 2033-03-14

Abstract

The application relates to a gantry machine tool and a beam transmission mechanism thereof. The crossbeam drive mechanism includes: a cross beam; the sliding seat comprises a main body part and a connecting part connected with the main body part, and the connecting part protrudes out of the main body part, so that an installation space is enclosed between the main body part and the connecting part, and at least part of the cross beam is accommodated in the installation space; the linear motor comprises a stator fixedly arranged on the cross beam and a rotor fixedly arranged on the main body part, and the rotor is connected with the stator and moves relatively; the connecting portion is connected with the cross beam in a sliding mode from the upper portion of the cross beam, and the main body portion is connected with the cross beam in a sliding mode on one side, away from the connecting portion, of the linear motor. The linear motor drives the sliding seat to move fast relative to the cross beam, so that the five-shaft head connected with the sliding seat can change the machining position fast, the movement time consumption is shortened, and the machining efficiency is improved. The connecting part protrudes out of the main body part and forms an installation space for accommodating part of the cross beam, the sliding seat is in sliding connection with the cross beam at two sides of the linear motor, the whole structure is compact, and the cross beam can move stably relative to the sliding seat.

Description

Gantry type machine tool and beam transmission mechanism thereof

Technical Field

The application relates to the technical field of machine tools, in particular to a gantry machine tool and a beam transmission mechanism thereof.

Background

For the processing of large-scale workpieces to be processed, the processing needs to be realized by a gantry type machine tool. However, the relative motion along the Y direction is realized between the beam and the slide seat of the beam transmission mechanism in the gantry machine tool in the prior art through the mode of the cooperation transmission of the screw rod and the nut seat, so that the transmission speed is low, the processing efficiency is reduced, and the nut seat is easy to be blocked with the screw rod and cannot be smoothly transmitted because of the need of supporting the weight of the slide seat and the structures such as a ram, a five-shaft head and the like arranged on the slide seat.

Disclosure of Invention

Based on the above, it is necessary to provide a beam transmission mechanism capable of realizing rapid and stable transmission, and also provide a gantry type machine tool having the beam transmission mechanism.

A beam drive mechanism comprising:

a cross beam;

the sliding seat comprises a main body part and a connecting part connected with the main body part, and the connecting part protrudes out of the main body part, so that an installation space is enclosed between the main body part and the connecting part, and at least part of the cross beam can be accommodated in the installation space; and

The linear motor comprises a stator fixedly arranged on the cross beam and a rotor fixedly arranged on the main body part, and the rotor is connected with the stator and can move relative to the stator along the Y direction;

the connecting part is in sliding connection with the cross beam from the upper part of the cross beam, and the main body part is in sliding connection with the cross beam at one side of the linear motor, which is far away from the connecting part.

In the beam transmission mechanism, the linear motor can drive the sliding seat to rapidly move relative to the beam along the Y direction, so that the processing position of the five shaft heads connected with the sliding seat is rapidly changed, the movement time consumption is shortened, and the processing efficiency is improved. Through making connecting portion protrusion in main part and enclose into the installation space between the two to at least partial crossbeam can hold in the installation space, not only can make the structure compacter, connecting portion can be in the top and crossbeam sliding connection of crossbeam moreover, thereby the crossbeam can provide supporting effort to the slide and bear the weight of a part of slide and each structure of connecting on the slide in the Z direction, and then reduce the loading that linear electric motor department received, ensure that linear electric motor steadily drives the slide and follow Y direction motion. In addition, through making slide and crossbeam in the equal sliding connection of linear electric motor's both sides to two sliding connection can cooperate together and provide outside the support to the slide, can also ensure that the dead problem of card can not appear between slide and the crossbeam, ensures that crossbeam and slide are steady along Y direction relative motion.

In one embodiment, the beam transmission mechanism comprises two sliding support assemblies, the two sliding support assemblies are respectively located at two sides of the linear motor, one sliding support assembly is connected between the main body portion and the beam, the other sliding support assembly is connected between the beam and the connecting portion, and the beam and the sliding seat are in sliding connection through the sliding support assemblies.

In one embodiment, the sliding support assembly comprises a sliding rail and a plurality of sliding blocks in sliding connection with the sliding rail, the sliding rail is arranged on the cross beam, and the sliding blocks are arranged on the sliding seat at intervals along the extending direction of the sliding rail.

In one embodiment, the sliding seat is hollow, and one side of the sliding seat, which is away from the mover, is hollow.

In one embodiment, the beam transmission mechanism comprises a ram, a first driving piece and five shaft heads, wherein the first driving piece is installed on the main body part and connected with the ram to drive the ram to move along the Z direction; the five-shaft head is arranged on the ram and is provided with a cutter for processing a workpiece to be processed.

In one embodiment, a containing groove is formed in one side of the main body part, which is away from the cross beam, and the cross section of the main body part is U-shaped, and the ram is arranged in the containing groove; the beam transmission mechanism comprises two second driving parts, the two second driving parts are arranged on the main body part and are respectively positioned on two sides of the ram along the Y direction, and the two second driving parts are connected with the ram so as to be matched with the first driving parts to drive the ram to slide along the Z direction.

In one embodiment, the main body part is hollow, and a bottom wall of the accommodating groove is provided with a chute which is communicated with the inner space of the main body part and extends along the Z direction; the first driving piece comprises a servo motor, a screw rod and a nut seat, wherein the servo motor is installed in the main body part, the screw rod is accommodated in the main body part, two ends of the screw rod are rotationally connected with the main body part, the nut seat is sleeved on the screw rod and is in threaded connection with the screw rod, and the nut seat is located in the sliding groove and is connected with the ram.

In one embodiment, the main body part is further provided with two supporting parts, and the two second driving pieces are respectively installed on the two supporting parts; the second driving parts are all air cylinders.

In one embodiment, the ram is hollow and has two first side surfaces and two second side surfaces, the two first side surfaces are oppositely arranged, one of the first side surfaces is close to the slide seat, the other first side surface is away from the slide seat, and the two second side surfaces are opposite and are both connected between the two first side surfaces; an observation window is formed in the first side face, and first lightening holes are formed in two sides of the observation window; the second side face is provided with a second lightening hole and a third lightening hole, the second lightening hole is positioned on one side, close to the sliding seat, of the third lightening hole, and the area of the second lightening hole is smaller than that of the third lightening hole.

A gantry machine tool comprises the beam transmission mechanism.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a beam transmission mechanism according to an embodiment of the present application;

FIG. 2 is an enlarged schematic view of a carriage and its partial structure in the beam drive mechanism shown in FIG. 1;

FIG. 3 is a schematic view of the side of the carriage coupled to the ram of the beam drive mechanism of FIG. 1;

FIG. 4 is a schematic illustration of the structure of a ram in the beam drive mechanism of FIG. 1;

reference numerals illustrate:

100. a beam transmission mechanism; 100. a cross beam; 200. a slide; 210. a main body portion; 220. a connection part; 230. an installation space; 240. a receiving groove; 250. a chute; 260. a support part; 300. a linear motor; 310. a stator; 320. a mover; 400. a sliding support assembly; 410. a slide rail; 420. a slide block; 500. a brake block; 600. a ram; 610. a first side; 620. an observation window; 630. a first lightening hole; 640. a second side; 650. a second lightening hole; 660. a third lightening hole; 700. a first driving member; 710. a servo motor; 720. a screw rod; 730. a nut seat; 800. five shaft heads; 900. and a second driving member.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "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 orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

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 at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated 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; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 to 4, the present application provides a beam transmission mechanism 100, which includes a beam 100, a sliding seat 200, and a linear motor 300. The sliding seat 200 includes a main body 210 and a connecting portion 220 connected to the main body 210, where the connecting portion 220 protrudes from the main body 210, so that an installation space 230 is defined between the two, and at least part of the beam 100 can be accommodated in the installation space 230. The linear motor 300 includes a stator 310 fixedly mounted to the cross member 100 and a mover 320 fixedly mounted to the main body 210, and the mover 320 is connected to the stator 310 and is movable in the Y direction with respect to the stator 310. The connection portion 220 is slidably connected to the cross beam 100 from above the cross beam 100, and the main body portion 210 is slidably connected to the cross beam 100 on a side of the linear motor 300 remote from the connection portion 220.

It can be appreciated that the linear motor 300 is connected between the connecting portion 220 and the cross beam 100, so that the sliding seat 200 moves along the Y direction relative to the cross beam 100 under the driving of the linear motor 300, and further the five-axis head 800 connected to the sliding seat 200 can change positions along the Y direction to implement the machining of different positions on the workpiece. Compared with the conventional mode of adopting the screw rod 720 for transmission, the linear motor 300 can realize the rapid movement of the sliding seat 200 along the Y direction, so that the five-shaft head 800 can rapidly change the processing position, the movement time consumption is shortened, and the processing efficiency is improved.

It can be appreciated that, by making the connecting portion 220 protrude from the main body portion 210 and enclose the installation space 230 therebetween, at least a portion of the beam 100 can be accommodated in the installation space 230, which not only can make the structure more compact, but also the connecting portion 220 can be slidably connected with the beam 100 above the beam 100, so that the beam 100 can provide supporting force for the sliding seat 200 in the Z direction to bear a portion of the sliding seat 200 and the weight of each structure connected to the sliding seat 200, thereby reducing the load applied to the position of the linear motor 300 and ensuring that the linear motor 300 stably drives the sliding seat 200 to move in the Y direction.

It can be appreciated that by making the sliding base 200 and the cross beam 100 slidingly connected on both sides of the linear motor 300, the two sliding connections can cooperate together to provide support for the sliding base 200, and can also ensure that the sliding base 200 and the cross beam 100 are not jammed, and ensure that the cross beam 100 and the sliding base 200 move smoothly relative to each other along the Y direction.

Referring to fig. 1 to 3, in the embodiment, the beam transmission mechanism 100 includes two sliding support assemblies 400, where the two sliding support assemblies 400 are respectively located at two sides of the linear motor 300, one sliding support assembly 400 is connected between the main body 210 and the beam 100, the other sliding support assembly 400 is connected between the beam 100 and the connecting portion 220, and the beam 100 and the sliding seat 200 are in sliding connection through the sliding support assemblies 400. The two sliding support assemblies 400 are disposed at both sides of the linear motor 300 and cooperate to enable the cross beam 100 and the slide carriage 200 to smoothly realize relative sliding, and the cross beam 100 can also support the slide carriage 200 in the vertical direction through the two sliding support assemblies 400.

Specifically, the sliding support assembly 400 includes a sliding rail 410 and a plurality of sliding blocks 420 slidably connected with the sliding rail 410, the sliding rail 410 is disposed on the cross beam 100, and the sliding blocks 420 are disposed on the sliding base 200 at intervals along the extending direction of the sliding rail 410. The sliding blocks 420 are connected with the sliding seat 200 at intervals, so that the sliding blocks 420 can provide stable support for the sliding seat 200, and meanwhile, the sliding stability of the sliding seat 200 relative to the cross beam 100 can be improved, and the problem of locking is avoided. Specifically, there are two sliding blocks 420 on the same sliding rail 410, and in other embodiments, the number of sliding blocks 420 may also be changed.

Further, in the present application, a brake block 500 is further disposed between the two sliding blocks 420, and the brake block 500 is mounted on the sliding base 200, and can tightly hold the sliding rail 410 to prevent the sliding base 200 from moving relative to the cross beam 100 or release the sliding rail 410 to enable the sliding base 200 to move relative to the cross beam 100. Specifically, two brake pads 500 are disposed immediately between two sliders 420.

In this application, the inside of the sliding seat 200 is hollow, and one side of the sliding seat 200 facing away from the cross beam 100 is hollow. By making the inside of the slider 200 hollow, the weight of the slider 200 can be reduced, and the speed and the degree of smoothness of the movement of the slider 200 relative to the cross member 100 in the Y direction can be improved. In addition, one side of the sliding seat 200, which faces away from the cross beam 100, includes one side of the connecting portion 220, which faces away from the cross beam 100, and one side of the main body portion 210, which faces away from the cross beam 100, is provided with a hollow hole, one side of the main body portion 210, which faces away from the cross beam 100, can be conveniently locked on the main body portion 210 from the rear by using a threaded connection piece, and one side of the connecting portion 220, which faces away from the cross beam 100, is provided with a hollow hole, which can be helpful for locking the other sliding support assembly 400 on the connecting portion 220 from the upper by using a threaded connection piece. In addition, the hollow structure can also help to reduce the weight of the sliding seat 200.

In the present application, the beam transmission mechanism 100 includes a ram 600, a first driving member 700 and a five-shaft head 800, wherein the first driving member 700 is mounted on the main body 210 and connected to the ram 600 to drive the ram 600 to move along the Z direction; the five-axis head 800 is mounted to the ram 600 and is mounted with a tool for machining a workpiece to be machined. It will be appreciated that, under the driving of the first driving member 700, the ram 600 drives the five-axis head 800 to move along the Z direction relative to the slide 200, so that the five-axis head 800 can approach or separate from the workpiece in the Z direction, so as to facilitate the processing operation of the workpiece.

Further, a receiving groove 240 is formed on one side of the main body 210 facing away from the cross beam 100, and the cross section of the main body is in a U shape, and a ram 600 is mounted in the receiving groove 240; the beam transmission mechanism 100 includes two second driving members 900, where the two second driving members 900 are disposed on the main body 210 and are located on two sides of the ram 600 along the Y direction, and the two second driving members 900 are connected to the ram 600 to cooperate with the first driving member 700 to drive the ram 600 to slide along the Z direction.

It can be appreciated that by providing the main body 210 with the accommodating groove 240, the ram 600 can be closer to the mover 320 after the ram 600 is mounted in the accommodating groove 240, so as to reduce the moment and improve the smoothness of the movement of the ram 600 and the carriage 200 in the Y direction relative to the cross beam 100. It will be appreciated that by providing the second driving members 900 on both sides of the ram 600 in the Y direction, respectively, the two second driving members 900 can be made to smoothly drive the ram 600 to move in the Z direction relative to the slider 200 in cooperation with the first driving member 700.

Specifically, the main body 210 is hollow, and the bottom wall of the accommodating groove 240 is provided with a chute 250 which is communicated with the inner space of the main body 210 and extends along the Z direction; the first driving member 700 includes a servo motor 710, a screw rod 720 and a nut seat 730, the servo motor 710 is mounted in the main body 210, the screw rod 720 is accommodated in the main body 210, two ends of the screw rod 720 are rotatably connected with the main body 210, the nut seat 730 is sleeved on the screw rod 720 and is in threaded connection with the screw rod 720, and the nut seat 730 is located in the chute 250 and is connected with the ram 600. It can be appreciated that, the first driving member 700 drives the ram 600 to move along the Z direction relative to the slide 200 by the way of the screw rod 720 and the nut seat 730, and compared with the driving manner of the linear motor 300, the first driving member 700 can drive the ram 600 and the five-axis head 800 to move along the Z direction at a relatively smaller speed, which can facilitate the processing operation of the five-axis head 800300 with higher precision on the workpiece to be processed along the Z direction.

In particular, in the present application, the feeding speed of the linear motor 300 is 100m/min, and the feeding speed of the servo motor 710 is 60m/min. It can be understood that the speed of the sliding seat 200 driving the five-axis head 800 to move along the Y direction relative to the cross beam 100 is 100m/min, the speed of the nut seat 730 driving the ram 600 and the five-axis head 800 to move along the Z direction relative to the sliding seat 200 is 60m/min, and it can be known by comparison that the speed of the five-axis head 800 moving along the Z direction is smaller than the speed of the five-axis head moving along the Y direction, so that the five-axis head 800 can move quickly along the Y direction on a workpiece to be processed to change the position, and meanwhile, the movement in the Z direction is relatively slow to perform the processing operation with higher precision on the workpiece to be processed.

Specifically, the main body 210 is further provided with two supporting portions 260, and two second driving members 900 are respectively installed on the two supporting portions 260, and the second driving members 900 are all cylinders. By providing two support portions 260, mounting positions for the two second driving members 900 can be provided. In addition, the support portion 260 may provide the second driving member 900 with a larger installation space 230, so that the second driving member 900 outputs a larger stroke in the Z direction to the ram 600. Specifically, the cylinder of the second driving member 900 is mounted to the support plate, and the end of the piston rod is connected to the ram 600.

Referring to fig. 1 and fig. 4, in the embodiment of the present application, the ram 600 is hollow and has two first sides 610 and two second sides 640, the two first sides 610 are disposed opposite to each other, one of the first sides 610 is close to the slide 200, the other first side 610 faces away from the slide 200, and the two second sides 640 are opposite to each other and are connected between the two first sides 610; the first side 610 is provided with an observation window 620, and both sides of the observation window 620 are provided with first lightening holes 630; the second side 640 is provided with a second lightening hole 650 and a third lightening hole 660, the second lightening hole 650 is positioned at one side of the third lightening hole 660, which is close to the sliding seat 200, and the area of the second lightening hole 650 is smaller than that of the third lightening hole 660.

It will be appreciated that by having the ram 600 internally hollow, the weight of the ram 600 may be reduced, thereby facilitating smooth movement of the ram 600 in the Z direction relative to the carriage 200, and the carriage 200 in the Y direction relative to the beam 100. In addition, by providing the observation window 620 on the first side 610, the structure installed in the ram 600 can be observed conveniently, and the weight can be reduced. Further, the first weight-reducing holes 630 of the first side 610, the second weight-reducing holes 650 of the second side 640, and the third weight-reducing holes 660 all play a role in weight reduction of the ram 600. Further, the inside of the ram 600 is provided with reinforcing ribs in a zigzag shape, thereby improving the overall structural strength.

It will be appreciated that the area of the second lightening holes 650 is smaller than the area of the third lightening holes 660, so that the structural strength of the side of the ram 600 close to the slider 200 is greater than that of the side far from the slider 200, thereby ensuring the structural strength of the connection of the ram 600 with the slider 200. Further, the second weight-reducing hole 650 includes a plurality of circular holes aligned in the Z direction, and the third weight-reducing hole 660 includes a plurality of circular holes aligned in the Z direction.

The application also protects a gantry type machine tool, which comprises the beam transmission mechanism 100 and a machine tool body, wherein the beam transmission mechanism 100 is arranged on the machine tool body and can move relative to the machine tool body along the X direction. Specifically, an X-axis driving member is disposed between the cross beam 100 and the bed, and the X-axis driving member drives the cross beam 100 to move along the X-direction relative to the bed. Further, the X-axis driving member is a linear driving member. Specifically, the gantry type machine tool includes two beam transmission mechanisms 100, and the two beam transmission mechanisms 100 are disposed at intervals in the X direction so as to be close to or distant from each other in the X direction. The two beam transmission mechanisms 100 are matched, so that different positions on a workpiece to be machined can be machined simultaneously, the machining time is shortened, and the machining efficiency is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A beam drive mechanism, comprising:

a cross beam;

2. The beam transmission mechanism according to claim 1, wherein the beam transmission mechanism includes two sliding support assemblies, the two sliding support assemblies are respectively located at two sides of the linear motor, one sliding support assembly is connected between the main body portion and the beam, the other sliding support assembly is connected between the beam and the connecting portion, and the beam and the slide seat are in sliding connection through the sliding support assemblies.

3. The beam transmission mechanism according to claim 2, wherein the sliding support assembly comprises a sliding rail and a plurality of sliding blocks slidably connected with the sliding rail, the sliding rail is disposed on the beam, and the sliding blocks are disposed on the sliding seat at intervals along an extending direction of the sliding rail.

4. The beam transmission mechanism according to claim 2, wherein the sliding seat is hollow, and one side of the sliding seat facing away from the beam is hollow.

5. The beam drive of claim 1, comprising a ram, a first drive member mounted to the body portion and connected to the ram for driving the ram in the Z-direction; the five-shaft head is arranged on the ram and is provided with a cutter for processing a workpiece to be processed.

6. The beam transmission mechanism according to claim 5, wherein a receiving groove is formed in a side of the main body portion facing away from the beam and has a cross section in a shape of a "U", and the ram is installed in the receiving groove; the beam transmission mechanism comprises two second driving parts, the two second driving parts are arranged on the main body part and are respectively positioned on two sides of the ram along the Y direction, and the two second driving parts are connected with the ram so as to be matched with the first driving parts to drive the ram to slide along the Z direction.

7. The beam transmission mechanism according to claim 6, wherein the main body portion is hollow, and a bottom wall of the accommodating groove is provided with a chute which communicates with an inner space of the main body portion and extends in the Z direction; the first driving piece comprises a servo motor, a screw rod and a nut seat, wherein the servo motor is installed in the main body part, the screw rod is accommodated in the main body part, two ends of the screw rod are rotationally connected with the main body part, the nut seat is sleeved on the screw rod and is in threaded connection with the screw rod, and the nut seat is located in the sliding groove and is connected with the ram.

8. The beam transmission mechanism according to claim 6, wherein the main body portion is further provided with two support portions, and the two second driving members are respectively mounted to the two support portions; the second driving parts are all air cylinders.

9. The beam drive of claim 5, wherein the ram is hollow and has two first sides and two second sides, the two first sides being disposed opposite one another, one of the first sides being adjacent to the slide and the other first side being opposite the slide, the two second sides being opposite one another and each being connected between the two first sides; an observation window is formed in the first side face, and first lightening holes are formed in two sides of the observation window; the second side face is provided with a second lightening hole and a third lightening hole, the second lightening hole is positioned on one side, close to the sliding seat, of the third lightening hole, and the area of the second lightening hole is smaller than that of the third lightening hole.

10. A gantry machine tool comprising a beam drive according to any one of claims 1 to 9.