CN216178401U - Machine tool - Google Patents

Abstract

The application discloses a machine tool. The application's lathe can further adjust the relative position of treating the product of processing and aircraft nose, in addition, can be convenient for replace the pedestal. The machine tool comprises a base, a saddle, a pedestal, a rotating table, an upright post and a machine head. It can be said that first counterpoint mechanism, second counterpoint mechanism can make the product of treating on the body be close to the aircraft nose on the horizontal direction, and third counterpoint mechanism can be the aircraft nose and be close to the product of treating on the body on the vertical direction, and rotary mechanism can adjust and make the relative angle between the product of treating on the body and the aircraft nose.

Description

Machine tool

Technical Field

The application relates to the technical field of machining equipment, in particular to a machine tool.

Background

Machine tool refers to a machine for manufacturing machines, also called a machine tool or a machine tool, and is called a machine tool for short. In the related art, the machine tool is generally a three-axis machine tool, namely, the machine tool is provided with three alignment mechanisms with different moving directions, so that a product to be processed and the machine head can move relatively in three directions, the product to be processed has a processing dead angle, and the production efficiency is not high. In addition, the alignment mechanism is generally fixedly connected with the pedestal, and when the pedestal with other sizes is needed, the pedestal is inconvenient to replace.

Disclosure of Invention

The present application is directed to solving at least one of the problems in the prior art. For this reason, the present application proposes a machine tool that can further adjust the relative position of the product to be machined and the head, and in addition, can facilitate replacement of the table base.

Machine tool according to the present application, comprising: base, saddle, pedestal, revolving stage, stand, aircraft nose.

The bed saddle is arranged on the base, a first aligning mechanism is arranged between the bed saddle and the base, and the first aligning mechanism is used for enabling the bed saddle to move along the horizontal direction; the first aligning mechanism comprises a first slide rail, a first slide seat and a first driving mechanism, the first slide rail is arranged on the base, the first slide seat is detachably connected with the saddle, the first driving mechanism is in driving connection with the saddle, the first driving mechanism is detachably connected with the saddle, and the first slide rail is in sliding fit with the first slide seat;

the pedestal is arranged on the saddle, and a second aligning mechanism is arranged between the pedestal and the saddle and used for enabling the saddle to move along the other horizontal direction; the second alignment mechanism comprises a second slide rail, a second slide seat and a second driving mechanism, the second slide rail is arranged on the saddle, the second slide seat is detachably connected with the pedestal, the second driving mechanism is in driving connection with the pedestal, the second driving mechanism is detachably connected with the pedestal, the second slide rail is in sliding fit with the second slide seat, and the second slide rail is intersected with the first slide rail;

the rotating table comprises a rotating mechanism and a body, the rotating mechanism is arranged on the pedestal, the body is arranged on the rotating mechanism, the body is used for placing a product to be processed, and the rotating mechanism is used for rotating the body;

a concave cavity is formed in the middle of the upright post along the vertical direction;

the aircraft nose is located the stand, the aircraft nose at least part is located the cavity, the aircraft nose with be equipped with third counterpoint mechanism between the inner wall of stand, third counterpoint mechanism is used for making the aircraft nose removes along vertical direction.

According to the machine tool of the embodiment of the application, at least the following beneficial effects are achieved: first actuating mechanism can dismantle with the saddle and be connected, can be convenient for change the saddle. The second driving mechanism is detachably connected with the pedestal, so that the pedestal can be conveniently replaced. The rotating mechanism can rotate the body, so that the product to be processed can rotate, the relative positions of each part of the product to be processed and the machine head can be adjusted, the processing dead angle is reduced, and the production efficiency is improved.

According to some embodiments of the present application, the first driving mechanism includes a first lead screw, a first lead screw nut, a first nut seat, and a first motor, the first lead screw is disposed in parallel with the first slide rail, the first nut seat is detachably connected to the saddle, the first lead screw nut is disposed on the first nut seat, the first lead screw is disposed on the first lead screw nut, and the first motor is drivingly connected to the first lead screw;

according to some embodiments of the present application, the second driving mechanism includes a second lead screw, a second lead screw nut, a second nut seat, and a second motor, the second lead screw is parallel to the second slide rail, the second nut seat is detachably connected to the pedestal, the second lead screw nut is disposed on the second nut seat, the second lead screw is disposed on the second lead screw nut, and the second motor drives the second lead screw.

According to some embodiments of the application, an avoidance cavity is formed between the upright and the base, and the first motor is at least partially located in the avoidance cavity.

According to some embodiments of the present application, a first opening is opened at one side of the first nut seat, and a diameter of the first opening is larger than a diameter of the first screw;

according to some embodiments of the present application, a second opening is opened at both sides of the second nut seat, and a diameter of the second opening is larger than a diameter of the second screw.

According to some embodiments of the present application, the base has a first receiving groove, and the first driving mechanism is at least partially located in the first receiving groove.

According to some embodiments of the present application, the saddle has a second receiving groove, and the second driving mechanism is at least partially located in the second receiving groove.

According to some embodiments of the application, third counterpoint mechanism includes third slide rail, first driver part, the third slide rail is located the stand, the aircraft nose slide set up in the third slide rail, first driver part drive connection the aircraft nose, just the third slide rail includes at least two, the third slide rail symmetry is located the both sides of cavity.

According to some embodiments of the application, the aircraft nose includes mount pad, second driver part, the mount pad sliding connection in the third slide rail, the second driver part is located the mount pad, just the second driver part is located in the cavity.

According to some embodiments of the present application, the mount pad has been seted up the through-hole, the through-hole is used for wearing to establish circuit or pipeline.

According to some embodiments of the application, the stand is equipped with the nitrogen gas pole, the nitrogen gas pole is fixed in the stand, the piston rod of nitrogen gas pole is connected the aircraft nose.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic view of the overall structure of a machine tool according to an embodiment of the present application;

FIG. 2 is a schematic view of a connection structure between a second alignment mechanism and a saddle according to an embodiment of the present application;

FIG. 3 is a schematic view of a connection structure of a first alignment mechanism, a column and a base according to an embodiment of the present disclosure;

FIG. 4 is an enlarged view taken at A of FIG. 3;

FIG. 5 is an enlarged view at B of FIG. 3;

fig. 6 is a schematic view of a connection structure of the first nut holder and the first feed screw nut.

Reference numerals:

the device comprises a base 100, a first accommodating groove 101 and an avoiding cavity 102;

the first aligning mechanism 200, the first slide rail 210, the first slide seat 220, the first driving mechanism 230, the first lead screw 231, the first lead screw nut 232, the first connecting block 2321, the first nut seat 233, and the first opening 2331;

a saddle 300 and a second receiving groove 301;

the second aligning mechanism 400, the second slide rail 410, the second slide seat 420, the second driving mechanism 430, the second lead screw 431, the second lead screw nut 432, the second nut seat 433 and the second opening 4331;

a pedestal 500;

a rotating table 600, a rotating mechanism 610, a body 620;

upright 700, cavity 710, nitrogen rod 720;

a third aligning mechanism 800, a third slide rail 810, a first driving part 820;

a handpiece 900, a mounting 910 and a through hole 911.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

A machine tool according to an embodiment of the present application includes: a base 100, a saddle 300, a pedestal 500, a rotary table 600, a column 700, and a head 900.

As shown in fig. 1, the saddle 300 is disposed on the base 100, a first aligning mechanism 200 is disposed between the saddle 300 and the base 100, and the first aligning mechanism 200 is used for moving the saddle 300 in the horizontal direction; the first aligning mechanism 200 includes a first slide rail 210, a first slide carriage 220, and a first driving mechanism 230, the first slide rail 210 is disposed on the base 100, the first slide carriage 220 is detachably connected to the saddle 300, the first driving mechanism 230 is connected to the saddle 300, and the first slide rail 210 is in sliding fit with the first slide carriage 220.

It is understood that the first aligning mechanism 200 can move the saddle 300 in one horizontal direction, and more particularly, the first driving mechanism 230 drives the saddle 300 to slide in the extending direction of the first rail. In addition, the first driving mechanism 230 is detachably connected to the saddle 300, so that the saddle 300 can be easily replaced. It can be noted that the first sliding seat 220 is also detachably connected to the saddle 300.

As shown in fig. 1, the base 500 is provided on the saddle 300, and a second aligning mechanism 400 is provided between the base 500 and the saddle 300, the second aligning mechanism 400 being used to move the saddle 300 in another horizontal direction; the second aligning mechanism 400 includes a second slide rail 410, a second slide seat 420, and a second driving mechanism 430, the second slide rail 410 is disposed on the saddle 300, the second slide seat 420 is detachably connected to the pedestal 500, the second driving mechanism 430 is connected to the pedestal 500 in a driving manner, the second driving mechanism 430 is detachably connected to the pedestal 500, the second slide rail 410 is in sliding fit with the second slide seat 420, and the second slide rail 410 intersects with the first slide rail 210.

It is understood that the second aligning mechanism 400 can move the pedestal 500 in another horizontal direction, specifically, the second driving mechanism 430 drives the pedestal 500 to slide along the extending direction of the second slide rail 410, and the moving direction of the pedestal 500 is perpendicular to the moving direction of the saddle 300. In addition, the second aligning mechanism 400 is detachably connected to the pedestal 500, so that the pedestal 500 with different sizes can be conveniently replaced. It is noted that the second carriage 420 is also removably connected to the pedestal 500.

As shown in fig. 1, the rotating table 600 includes a rotating mechanism 610 and a body 620, the rotating mechanism 610 is disposed on the pedestal 500, the body 620 is disposed on the rotating mechanism 610, the body 620 is used for placing a product to be processed, and the rotating mechanism 610 is used for rotating the body 620.

It will be appreciated that the rotating mechanism 610 is used to spin the body 620, thereby spinning the product to be processed.

As shown in fig. 1, a cavity 710 is formed in the middle of the pillar 700 in the vertical direction. The machine head 900 is arranged on the upright column 700, at least part of the machine head 900 is positioned in the concave cavity 710, a third aligning mechanism 800 is arranged between the machine head 900 and the inner wall of the upright column 700, and the third aligning mechanism 800 is used for enabling the machine head 900 to move along the vertical direction.

It can be appreciated that the cavity 710 is formed in the column 700, so that the machine head 900 can be partially positioned in the cavity 710, the space utilization rate can be improved, and the compactness of the whole structure of the machine tool can be improved.

In addition, the third aligning mechanism 800 serves to move the head 900 in a vertical direction so that the head 900 approaches or separates from the body 620.

It can be illustrated that the first aligning mechanism 200 and the second aligning mechanism 400 can enable the product to be processed on the body 620 to be close to the machine head 900 in the horizontal direction, the third aligning mechanism 800 can enable the machine head 900 to be close to the product to be processed on the body 620 in the vertical direction, and the rotating mechanism 610 can adjust the relative angle between the product to be processed on the body 620 and the machine head 900.

When the machine tool is used, the machine head 900 is provided with a cutter, the cutter is rotated, the relative position of a product to be processed and the cutter is adjusted through the first aligning mechanism 200, the second aligning mechanism 400, the third aligning mechanism 800 and the rotating mechanism 610, the cutter can cut the product from multiple angles, and the production efficiency is improved.

As shown in fig. 4, according to some embodiments of the present disclosure, the first driving mechanism 230 includes a first lead screw 231, a first lead screw nut 232, a first nut seat 233, and a first motor (not shown in the drawings), the first lead screw 231 is disposed in parallel with the first slide rail 210, the first nut seat 233 is detachably connected to the saddle 300, the first lead screw nut 232 is disposed on the first nut seat 233, the first lead screw 231 is disposed on the first lead screw nut 232, and the first motor is drivingly connected to the first lead screw 231;

it is understood that the first nut seat 233 can bring the saddle 300 to move along the first lead screw 231. The first nut seat 233 may be detachably connected to the saddle 300 by means of screw connection, snap connection, mortise and tenon connection, etc., so as to replace the saddle 300.

As shown in fig. 2, according to some embodiments of the present disclosure, the second driving mechanism 430 includes a second lead screw 431, a second lead screw nut 432, a second nut seat 433, and a second motor (not shown in the drawings), the second lead screw 431 is disposed in parallel with the second slide rail 410, the second nut seat 433 is detachably connected to the pedestal 500, the second lead screw nut 432 is disposed in the second nut seat 433, the second lead screw 431 is disposed in the second lead screw nut 432, and the second motor is drivingly connected to the second lead screw 431.

It is understood that the second nut base 433 can move the base 500 along the second lead screw 431. Wherein, second nut seat 433 can form to dismantle with pedestal 500 through modes such as threaded connection, buckle connection, mortise and tenon connection and be connected to in change pedestal 500.

As shown in fig. 5, according to some embodiments of the present application, an avoidance cavity 102 is formed between the pillar 700 and the base 100, and the first motor is at least partially located within the avoidance cavity 102.

It can be understood that the first lead screw 231 is disposed on the base 100, and in order to enable the body 620 to be closer to the machine head 900, the first lead screw 231 extends to the lower part of the machine head 900, and in order to improve the structural compactness of the machine tool, the first motor is installed in the avoiding cavity 102 between the upright 700 and the base 100.

As shown in fig. 4, according to some embodiments of the present disclosure, a first opening 2331 is formed at one side of the first nut seat 233, and a diameter of the first opening 2331 is greater than a diameter of the first lead screw 231; a first connecting block 2321 is formed on one end surface of the first feed screw nut 232, the first connecting block 2321 at least partially covers the end surface of the first nut seat 233, and the first connecting block 2321 is detachably connected with the first nut seat 233.

It is understood that the first opening 2331 opens at the lower end of the first nut seat 233. As shown in fig. 6, it can be understood that the first lead screw nut 232 and the first connecting block 2321 are integrally formed, and the first lead screw nut 232 and the first nut seat 233 are fixed by sequentially passing screws through the end surfaces of the first connecting block 2321 and the first nut seat 233. When the saddle 300 needs to be replaced, the screws are removed, the first lead screw nut 232 is pushed to move along the horizontal direction, so that the first lead screw nut 232 is separated from the first nut seat 233, then the first lead screw 231 can be separated from the first nut seat 233 more conveniently and rapidly through the first opening 2331, and the first lead screw 231 can be conveniently separated from the first nut seat 233, that is, the saddle 300 can be conveniently separated from the first lead screw 231.

As shown in fig. 2, according to some embodiments of the present disclosure, a second opening 4331 is opened on both sides of the second nut seat 433, and a caliber of the second opening 4331 is larger than a diameter of the second lead screw 431. A second connecting block is formed on one end face of the second feed screw nut 432, the second connecting block at least partially covers the end face of the second nut seat 433, and the second connecting block is detachably connected with the second nut seat 433.

It is understood that the second opening 4331 is provided at the lower end of the second nut holder 433. It can be understood that, as for the connection manner of the first lead screw nut 232 and the first nut seat 233, the second lead screw nut 432 and the second connecting block are integrally formed, and are sequentially threaded through the end surfaces of the second connecting block and the second nut seat 433 through screws, so that the second lead screw nut 432 and the second nut seat 433 are fixed together. When the pedestal 500 needs to be replaced, the screws are detached, the second lead screw nut 432 is pushed to move along the horizontal direction, so that the second lead screw nut 432 is separated from the second nut seat 433, then, the second lead screw 431 can be separated from the second nut seat 433 more conveniently and rapidly through the second opening 4331, the second lead screw 431 can be conveniently and rapidly separated from the second nut seat 433, and even if the pedestal 500 is separated from the second lead screw 431.

As shown in fig. 4, according to some embodiments of the present disclosure, the base 100 defines a first receiving groove 101, and the first driving mechanism 230 is at least partially located in the first receiving groove 101.

The base 100 is provided with the first accommodating groove 101 along the extending direction of the first lead screw 231, and the first lead screw 231 is located in the first accommodating groove 101, so that it can be understood that the overall structure compactness of the machine tool can be improved. In addition, the first accommodation groove 101 communicates with the bypass chamber 102.

As shown in fig. 2, according to some embodiments of the present application, the saddle 300 defines a second receiving groove 301, and the second driving mechanism 430 is at least partially located in the second receiving groove 301.

The saddle 300 has a second receiving groove 301 along the extending direction of the first screw 231, and the second screw 431 is located in the second receiving groove 301, so that it can be understood that the overall compactness of the machine tool can be improved.

As shown in fig. 1, according to some embodiments of the present disclosure, the third alignment mechanism 800 includes a third slide rail 810 and a first driving member 820, the third slide rail 810 is disposed on the upright 700, the machine head 900 is slidably disposed on the third slide rail 810, and the first driving member 820 is drivingly connected to the machine head 900.

It can be understood that the first driving part 820 drives the head 900 to slide along the extending direction of the third slide rail 810.

As shown in fig. 1, the third slide rail 810 includes at least two, and the third slide rail 810 is symmetrically disposed at two sides of the cavity 710.

In addition, the third slide rail 810 is arranged on one side of the upright 700 close to the body 620, so that the movement of the machine head 900 is more stable.

As shown in fig. 1, according to some embodiments of the present disclosure, the handpiece 900 includes a mounting base 910, a second driving member (not shown), the mounting base 910 is slidably connected to the third slide rail 810, the second driving member is disposed on the mounting base 910, and the second driving member is disposed in the cavity 710.

It can be understood that the first driving member 820 drives the mounting base 910 to slide along the third sliding rail 810, so as to drive the second driving member to move in the cavity 710, and the cavity 710 provides a moving space for the second driving member. In addition, a spindle for mounting a tool is disposed on the mounting base 910, and a second driving member is connected to the tool through the spindle to rotate the tool.

As shown in fig. 1, according to some embodiments of the present disclosure, the mounting base 910 has a through hole 911, and the mounting base 910 has a through hole 911, where the through hole 911 is used for passing a line or a pipeline.

For example, the mounting base 910 is provided with a control member (not shown), which can be used to control a component on the head 900, such as a clamp for clamping a tool. The through hole 911 is arranged in a penetrating way on the circuit of the control component, and the through hole 911 can facilitate the arrangement of the circuit.

For another example, a cooling device (not shown) is disposed on the mounting base 910, and a pipeline of the cooling device is inserted into the through hole 911 to facilitate the arrangement of the pipeline of the cooling device.

As shown in fig. 1, according to some embodiments of the present application, a nitrogen gas rod 720 is provided to a column 700, the nitrogen gas rod 720 is fixed to the column 700, and a piston rod of the nitrogen gas rod 720 is connected to a handpiece 900.

It can be understood that, when the handpiece 900 is in operation, the nitrogen rod 720 can be connected to the handpiece 900, the nitrogen rod 720 can provide an upward pulling force to the handpiece 900, the handpiece 900 has a heavy weight, when the first driving component 820 drives the handpiece 900 to move along the third sliding rail 810, the nitrogen rod 720 can reduce the pressure of the handpiece 900 on the first driving component 820, and the nitrogen rod 720 can improve the sliding stability of the handpiece 900.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims (10)

1. Machine tool, characterized in that it comprises:

a base;

the bed saddle is arranged on the base, a first aligning mechanism is arranged between the bed saddle and the base, and the first aligning mechanism is used for enabling the bed saddle to move along the horizontal direction; the first aligning mechanism comprises a first slide rail, a first slide seat and a first driving mechanism, the first slide rail is arranged on the base, the first slide seat is detachably connected with the saddle, the first driving mechanism is in driving connection with the saddle, the first driving mechanism is detachably connected with the saddle, and the first slide rail is in sliding fit with the first slide seat;

the pedestal is arranged on the saddle, and a second aligning mechanism is arranged between the pedestal and the saddle and is used for enabling the saddle to move along the other horizontal direction; the second alignment mechanism comprises a second slide rail, a second slide seat and a second driving mechanism, the second slide rail is arranged on the saddle, the second slide seat is detachably connected with the pedestal, the second driving mechanism is in driving connection with the pedestal, the second driving mechanism is detachably connected with the pedestal, the second slide rail is in sliding fit with the second slide seat, and the second slide rail is intersected with the first slide rail;

the rotating table comprises a rotating mechanism and a body, the rotating mechanism is arranged on the pedestal, the body is arranged on the rotating mechanism, the body is used for placing a product to be processed, and the rotating mechanism is used for rotating the body;

the middle of the upright post is provided with a concave cavity along the vertical direction;

the aircraft nose is located the stand, the aircraft nose at least part is located the cavity, the aircraft nose with be equipped with third counterpoint mechanism between the inner wall of stand, third counterpoint mechanism is used for making the aircraft nose removes along vertical direction.

2. The machine tool of claim 1,

the first driving mechanism comprises a first lead screw, a first lead screw nut, a first nut seat and a first motor, the first lead screw is arranged in parallel with the first slide rail, the first nut seat is detachably connected with the saddle, the first lead screw nut is arranged on the first nut seat in a penetrating manner, the first lead screw is arranged on the first lead screw nut in a penetrating manner, and the first motor is connected with the first lead screw in a driving manner;

the second driving mechanism comprises a second lead screw, a second lead screw nut, a second nut seat and a second motor, the second lead screw is arranged in parallel with the second slide rail, the second nut seat is detachably connected with the pedestal, the second lead screw nut is arranged in the second nut seat in a penetrating mode, the second lead screw is arranged in the second lead screw nut in a penetrating mode, and the second motor is connected with the second lead screw in a driving mode.

3. The machine tool of claim 2,

an avoiding cavity is formed between the upright post and the base, and at least part of the first motor is located in the avoiding cavity.

4. The machine tool of claim 2,

a first opening is formed in one side of the first nut seat, and the caliber of the first opening is larger than the diameter of the first screw rod;

and second openings are formed in two sides of the second nut seat, and the caliber of each second opening is larger than the diameter of the second screw rod.

5. The machine tool of claim 1,

the base is provided with a first accommodating groove, and the first driving mechanism is at least partially positioned in the first accommodating groove.

6. The machine tool of claim 1,

the bed saddle is provided with a second accommodating groove, and the second driving mechanism is at least partially positioned in the second accommodating groove.

7. The machine tool of claim 1,

the third aligning mechanism comprises a third slide rail and a first driving part, the third slide rail is arranged on the stand column, the machine head is arranged on the third slide rail in a sliding mode, the first driving part is connected with the machine head in a driving mode, the third slide rail comprises at least two, and the third slide rail is symmetrically arranged on two sides of the cavity.

8. The machine tool of claim 7,

the aircraft nose includes mount pad, second driver part, mount pad sliding connection in the third slide rail, the second driver part is located the mount pad, just the second driver part is located in the cavity.

9. The machine tool of claim 8,

the mounting seat is provided with a through hole, and the through hole is used for penetrating a circuit or a pipeline.

10. The machine tool of claim 8, wherein the column is provided with a nitrogen gas rod, the nitrogen gas rod is fixed to the column, and a piston rod of the nitrogen gas rod is connected with the machine head.

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