Measuring machine Z shaft and measuring machine

Abstract

The utility model provides a Z-axis of a measuring machine, which comprises a Z-axis body, a Z-axis upper end cover and a Z-axis lower end cover, the Z-axis body comprises a cylindrical silicon carbide body part, an annular body upper end cover and an annular body lower end cover, and the body upper end cover and the body lower end cover are fixedly connected to the upper end and the lower end of the silicon carbide body part respectively; the Z-axis upper end cover comprises an upper end cover top plate and an upper end cover circumferential side plate, the upper end cover top plate is fixedly connected with the body upper end cover in an attached mode, and the upper end cover circumferential side plate is fixedly connected with the upper end of the circumferential side plate of the silicon carbide body part in an attached mode; the Z-axis lower end cover comprises a lower end cover bottom plate and a lower end cover circumferential side plate, the lower end cover bottom plate is fixedly connected with the body lower end cover in an attached mode, and the lower end cover circumferential side plate is fixedly connected with the lower end of the circumferential side plate of the silicon carbide body in an attached mode. According to the Z shaft of the measuring machine, the silicon carbide body part of the Z shaft body is made of the silicon carbide material, so that manufacturing and application of the large-size Z shaft can be met; and the force of the upper end of the Z-axis with larger stress can be dispersed, so that the structural strength of the large-size Z-axis can also be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of measuring equipment, and in particular relates to a structural improvement of a Z axis of a measuring machine. Background Art

[0002] In the structure of the measuring machine, the Z axis is a core component, and its accuracy has an important impact on the accuracy and stability of the measuring machine. The main materials of the current measuring machine Z axis include aluminum alloy, marble and ceramics. Limited by the hardness, density and other characteristics of the material, it is difficult to ensure stable accuracy and processing quality for a large-size (large length, large cross-sectional size) Z axis, which limits the size of the measuring machine Z axis and its application scenarios. Summary of the invention

[0003] The utility model provides a measuring machine Z axis and a measuring machine, which can realize large-size design of the measuring machine Z axis.

[0004] In order to achieve the above technical effects, the technical solution adopted by the measuring machine Z axis proposed by the utility model is a measuring machine Z axis, comprising:

[0005] A Z-axis body, the Z-axis body comprising a cylindrical silicon carbide body portion, an annular body upper end cover and an annular body lower end cover, the body upper end cover and the body lower end cover are respectively fixedly connected to the upper and lower ends of the silicon carbide body portion;

[0006] The upper end cover of the Z-axis is made of metal and is covered on the upper end of the Z-axis body; the upper end cover of the Z-axis includes an upper end cover top plate and an upper end cover circumferential side plate, the upper end cover top plate is fitted and fixedly connected with the upper end cover of the body, and the upper end cover circumferential side plate is fitted and fixedly connected with the upper end of the circumferential side plate of the silicon carbide body;

[0007] The Z-axis lower end cover is made of metal material and is covered on the upper end of the Z-axis body; the Z-axis lower end cover includes a lower end cover bottom plate and a lower end cover circumferential side plate, the lower end cover bottom plate is fitted and fixedly connected to the lower end of the body lower end cover, and the lower end cover circumferential side plate is fitted and fixedly connected to the lower end of the circumferential side plate of the silicon carbide body.

[0008] The circumferential side plate of the upper end cover is fixedly connected to the upper end of the circumferential side plate of the silicon carbide body through a plurality of fastening components arranged along the circumferential direction, and the fastening components include an internal threaded pin sleeve and a fastening screw;

[0009] A horizontally penetrating pin sleeve mounting hole is provided on the upper end of the circumferential side plate of the silicon carbide body, and a horizontally penetrating screw mounting hole is correspondingly formed on the circumferential side plate of the upper end cover, the internal threaded pin sleeve is horizontally bonded in the pin sleeve mounting hole, and the fastening screw is horizontally installed in the screw mounting hole and is thread-fastened with the internal threaded pin sleeve;

[0010] The Z-axis upper end cover and the upper end of the Z-axis body are bonded together by adhesive filled between the two.

[0011] The inner end of the internal threaded pin sleeve is provided with a limiting head, and the limiting head abuts against the inner wall of the circumferential side plate of the silicon carbide body.

[0012] Glue injection holes are arranged on the circumferential side plate of the upper end cover, which are used to inject glue between the upper end cover of the Z-axis and the upper end of the Z-axis body through the glue injection holes.

[0013] The upper end cover of the main body and the lower end cover of the main body are also made of silicon carbide.

[0014] The upper end cover of the main body and the lower end cover of the main body are respectively inlaid with threaded sleeves so as to be respectively screwed to the top plate of the upper end cover and the bottom plate of the lower end cover.

[0015] The measuring machine Z axis also includes a grating ruler assembly, and the grating ruler assembly includes a grating ruler and a reading head;

[0016] The extension direction of the grating ruler is parallel to the extension direction of the Z-axis body, the upper end of the grating ruler is fixedly connected to the upper end cover of the Z-axis, and the lower end of the grating ruler is fixedly connected to the lower end cover of the Z-axis;

[0017] The reading head is mounted on the Z-axis slide.

[0018] The upper end of the grating ruler is fixedly connected to the upper end cover of the Z axis through an upper fixing component, and the lower end of the grating ruler is fixedly connected to the lower end cover of the Z axis through a lower fixing component.

[0019] The utility model also provides a measuring machine, comprising the above-mentioned measuring machine Z axis.

[0020] Compared with the prior art, the utility model has the following advantages and positive effects:

[0021] 1. The Z-axis of the measuring machine of the utility model is a split structure, including a Z-axis body, an upper end cover of the Z-axis and a lower end cover of the Z-axis, wherein the main body of the Z-axis body, namely the silicon carbide main body, is made of silicon carbide material, which has stable chemical properties and good wear resistance, so it can obtain better precision stability; the silicon carbide main body has the characteristics of high thermal conductivity and small thermal expansion coefficient, so that when it is applied to the main body of the Z-axis of the measuring machine, it can still maintain high precision when the temperature changes; at the same time, the silicon carbide main body has a low density, which is close to that of aluminum alloy. As a material for making the Z-axis, it can effectively reduce the mass of the Z-axis and realize the light movement of the mechanism; the silicon carbide main body has a high hardness. During the processing, by grinding the silicon carbide main body, it can obtain surface processing quality that is difficult to obtain with other materials, improve the characteristics of equipment precision, etc., and can meet the production and application of large-size Z-axis;

[0022] 2. The upper end cover of the Z-axis is made of metal and is covered on the upper end of the Z-axis body. The upper end cover of the Z-axis includes an upper end cover top plate and an upper end cover circumferential side plate. The upper end cover top plate is fitted and fixedly connected to the upper end cover of the body, and the upper end cover circumferential side plate is fitted and fixedly connected to the upper end of the circumferential side plate of the silicon carbide body. The metal upper end cover of the Z-axis is in contact with the Z-axis body with the largest area, so that the force on the upper end of the Z-axis that is subjected to greater force is dispersed, and the structural strength can also be guaranteed for large-size Z-axes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 This is a schematic diagram of the Z-axis structure of the measuring machine in the embodiment of the utility model;

[0025] Figure 2 for Figure 1 A magnified view of part A;

[0026] Figure 3 for Figure 1 A magnified view of part B;

[0027] Figure 4 This is a schematic diagram of the exploded structure of the upper end cover of the Z-axis and the upper end of the Z-axis body in the embodiment of the utility model;

[0028] Figure 5 This is a schematic diagram of the exploded structure of the Z-axis lower end cover and the lower end of the Z-axis body in the embodiment of the utility model;

[0029] Figure 6 for Figure 1 C-direction front view;

[0030] Figure 7 for Figure 6 An enlarged view of the DD cross-sectional view;

[0031] Figure 8 for Figure 6 EE section view;

[0032] Fig. 9 for Figure 8 Enlarged view of part F.

[0033] Reference numerals:

[0034] 100, Z-axis body; 110, silicon carbide body; 111, pin sleeve mounting hole; 120, body upper end cover; 130, body lower end cover; 140, threaded sleeve; 200, Z-axis upper end cover; 210, upper end cover top plate; 211, protrusion; 220, upper end cover circumferential side plate; 221, screw mounting hole; 222, glue injection hole; 300, Z-axis lower end cover; 310, lower end cover bottom plate; 320, lower end cover circumferential side plate; 40 0. Fastening assembly; 410. Internal threaded pin sleeve; 411. Limiting head; 420. Fastening screw; 500. Grating scale; 600. Upper fixing assembly; 610. Inverted L-shaped connecting block; 611. Horizontal part; 612. Vertical part; 620. Locking nut; 630. First screw; 640. Second screw; 650. Third screw; 700. Lower fixing assembly; 710. Fourth screw; 720. Fastening pad; 800. Guide rail. DETAILED DESCRIPTION

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Reference Figures 1 to 9 In some embodiments of the present application, a measuring machine Z-axis is proposed, including a Z-axis body 100, a Z-axis upper end cover 200 and a Z-axis lower end cover 300.

[0038] Among them, the Z-axis body 100 includes a cylindrical silicon carbide body part 110, an annular upper end cover 120 and an annular lower end cover 130. The upper end cover 120 and the lower end cover 130 are respectively fixed to the upper and lower ends of the silicon carbide body part 110, so that the Z-axis body 100 is cylindrical as a whole, which is convenient for internal wiring and other operations.

[0039] The silicon carbide main body 110 is made of silicon carbide, which has stable chemical properties and good wear resistance, so it can obtain better precision stability; silicon carbide has the characteristics of high thermal conductivity and small thermal expansion coefficient, so when it is applied to the main body of the Z-axis of the measuring machine, it can still maintain high precision when the temperature changes; at the same time, the density of silicon carbide is small, close to that of aluminum alloy. As a material for making the Z-axis, it can effectively reduce the mass of the Z-axis and realize the light movement of the mechanism; silicon carbide has high hardness. During the processing, by grinding the silicon carbide main body 110, it is possible to obtain surface processing quality that is difficult to obtain with other materials, improve equipment accuracy and other characteristics, and thus meet the production and application of large-size Z-axes.

[0040] The Z-axis upper end cover 200 is made of metal and is covered on the upper end of the Z-axis body 100; the Z-axis upper end cover 200 includes an annular upper end cover top plate 210 and an upper end cover circumferential side plate 220, the upper end cover top plate 210 is fitted and fixedly connected to the upper end cover 120 of the body, and the upper end cover circumferential side plate 220 is fitted and fixedly connected to the upper end of the circumferential side plate of the silicon carbide body 110, so that the metal Z-axis upper end cover 200 is in contact with the Z-axis body 100 with the maximum area, so that the force on the upper end of the Z-axis that is subjected to greater force is dispersed, and the structural strength can also be guaranteed for a large-sized Z-axis.

[0041] The Z-axis lower end cover 300 is also made of metal material and is covered on the upper end of the Z-axis body 100; the Z-axis lower end cover 300 includes an annular lower end cover base plate 310 and a lower end cover circumferential side plate 320, the lower end cover base plate 310 is fitted and fixedly connected to the body lower end cover 130, and the lower end cover circumferential side plate 320 is fitted and fixedly connected to the lower end of the circumferential side plate of the silicon carbide body 110 to enhance the connection strength between the Z-axis lower end cover 300 and the Z-axis body 100, which is beneficial to further ensure the overall structural strength of the large-size Z-axis.

[0042] In some embodiments of the present application, Figure 1 and Figure 2 , Figures 4 to 7 As shown, the circumferential side plate 220 of the upper end cover is fixedly connected to the upper end of the circumferential side plate of the silicon carbide body 110 by a plurality of fastening assemblies 400 arranged along the circumferential direction. The fastening assembly 400 includes an internal threaded pin sleeve 410 and a fastening screw 420 .

[0043] In some embodiments of the present application, a horizontally through pin sleeve mounting hole 111 is provided on the upper end of the circumferential side plate of the silicon carbide body 110, and correspondingly, a horizontally through screw mounting hole 221 is formed on the circumferential side plate 220 of the upper end cover, and the internal threaded pin sleeve 410 is horizontally inserted into the pin sleeve mounting hole 111 and bonded to the pin sleeve mounting hole 111, and the fastening screw 420 is horizontally installed in the screw mounting hole 221 from the outside to the inside and is threadedly fastened with the internal threaded pin sleeve 410, such as Figure 4 and Figure 7 shown.

[0044] At the same time, the Z-axis upper end cover 200 and the upper end of the Z-axis body 100 are bonded together by an adhesive filled between the two.

[0045] Specifically, glue is applied to the outer cylindrical surface of the internal threaded pin sleeve 410 to bond with the pin sleeve mounting hole 111, and is locked and connected to the Z-axis upper end cover 200 by the fastening screw 420, and the Z-axis upper end cover 200 and the upper end of the Z-axis body 100 are also bonded as a whole by the adhesive filled between the two, so that the Z-axis upper end cover 200 and the Z-axis body 100 form an integrated structure, and the internal threaded pin sleeve 410 horizontally supports the Z-axis body 100 through the locking screw, so that the force on the upper end of the Z-axis, which is subjected to greater force, is further fully dispersed, thereby ensuring the structural strength of the large-size Z-axis.

[0046] Furthermore, the inner end of the internal threaded pin sleeve 410 has a limiting head 411, and the limiting head 411 abuts against the inner wall of the circumferential side plate of the silicon carbide body 110. That is, the limiting head 411 is annular and coaxial with the internal threaded pin sleeve 410. During installation, the internal threaded pin sleeve 410 is inserted into the pin sleeve mounting hole 111 from the inside to the outside inside the silicon carbide body 110 until its limiting head 411 abuts against the inner wall of the circumferential side plate of the silicon carbide body 110. At this time, the outer end of the internal threaded pin sleeve 410 is flush with the outer end of the pin sleeve mounting hole 111 so as not to hinder the circumferential fit between the Z-axis upper end cover 200 and the silicon carbide body 110.

[0047] On the one hand, the limiting head 411 plays a positioning role in the installation of the internal threaded pin sleeve 410. On the other hand, through its abutment with the inner wall of the circumferential side plate of the silicon carbide main body 110, it can also improve the integral structural strength of the Z-axis upper end cover 200 and the Z-axis body 100, which is beneficial to improve the overall structural strength of the Z-axis, thereby facilitating the large-size design of the Z-axis.

[0048] For ease of processing, the cross-section of the Z-axis body 100 is rectangular, such as a rectangle or a square. Accordingly, the internal threaded pin sleeve 410 can be distributed in opposite directions, that is, relatively arranged on two opposite sides of the silicon carbide main body 110; or, the internal threaded pin sleeve 410 is arranged on the surrounding sides of the silicon carbide main body 110, or, the internal threaded pin sleeve 410 is arranged on two adjacent vertical sides or three of the sides of the silicon carbide main body 110.

[0049] In some embodiments of the present application, Figure 3 and Figure 4As shown, glue injection holes 222 are arranged on the circumferential side plate 220 of the upper end cover, which are used to inject glue between the upper end cover 200 of the Z-axis and the upper end of the Z-axis body 100 through the glue injection holes 222. Similarly, there can be multiple glue injection holes 222, which are arranged relatively on the circumferential side plate 220 of the upper end cover, or on two adjacent vertical side surfaces or three of the side surfaces of the circumferential side plate 220 of the upper end cover. The glue between the upper end cover 200 of the Z-axis and the upper end of the Z-axis body 100 fills the gap between the upper end cover top plate 210 of the upper end cover 200 of the Z-axis and the upper end cover 120 of the body, and the gap between the circumferential side plate 220 of the upper end cover and the upper end of the circumferential side plate of the silicon carbide body 110, so that the upper end cover 200 of the Z-axis and the Z-axis body 100 form a whole, so that the force on the upper end of the Z-axis, which is subjected to greater force, is fully dispersed.

[0050] The upper end cover 120 and the lower end cover 130 of the Z-axis body 100 may be made of the same material as the silicon carbide body 110 , that is, also made of silicon carbide, or other materials.

[0051] Furthermore, for the fitting and fixing connection between the upper end cover top plate 210 and the upper end cover 120 of the body, and the fitting and fixing connection between the lower end cover bottom plate 310 and the lower end cover 130 of the body. Specifically, if the upper end cover 120 and the lower end cover 130 of the body are made of silicon carbide, through holes are formed on the upper end cover 120 and the lower end cover 130 of the body, and threaded sleeves 140 are embedded in the through holes. The threaded sleeves 140 have internal threads so as to realize screw connection with the upper end cover top plate 210 and the lower end cover bottom plate 310 respectively. By adopting this connection method, the adverse effect on the strength of the upper end cover 120 and the lower end cover 130 of the body made of silicon carbide can be minimized, thereby reducing the adverse effect on the strength of the entire Z-axis.

[0052] In some embodiments of the present application, the Z-axis of the measuring machine further includes a grating scale assembly to detect displacement in the Z direction, and the grating scale assembly includes a grating scale 500 and a reading head (not shown).

[0053] like Figures 1 to 3 , Figure 6 , Figure 8 and Fig. 9 As shown, the extension direction of the grating ruler 500 is parallel to the extension direction of the Z-axis body 100, the upper end of the grating ruler 500 is fixedly connected to the Z-axis upper end cover 200, and the lower end of the grating ruler 500 is fixedly connected to the Z-axis lower end cover 300. The grating ruler 500 moves along the Z direction together with the whole body composed of the Z-axis body 100, the Z-axis upper end cover 200 and the Z-axis lower end cover 300. The reading head is installed on the Z-axis slide and does not move in the Z direction. The measurement of the Z-direction displacement is achieved through the cooperation of the grating ruler 500 and the reading head.

[0054] A guide rail 800 that is consistent with the extension direction of the grating scale 500 is bonded to the silicon carbide main body 110. The body of the grating scale 500 is embedded in the guide rail 800. The guide rail 800 plays a positioning role for the grating scale 500, ensuring the position stability of the grating scale 500, which is conducive to ensuring its measurement accuracy.

[0055] In some embodiments of the present application, the upper end of the grating ruler 500 is fixedly connected to the Z-axis upper end cover 200 through an upper fixing assembly 600, and the lower end of the grating ruler 500 is fixedly connected to the Z-axis lower end cover 300 through a lower fixing assembly 700.

[0056] The upper fixing assembly 600 specifically includes an inverted L-shaped connecting block 610 and a locking nut 620. A protrusion 211 is formed on the top surface of the upper end cover top plate 210 of the Z-axis upper end cover 200; the horizontal portion 611 of the inverted L-shaped connecting block 610 is located above the protrusion 211, and a first screw 630 is fastened on the horizontal portion 611, and the first screw 630 rests on the top surface of the protrusion 211; the vertical portion 612 of the inverted L-shaped connecting block 610 is located on the outer side of the protrusion 211 of the upper end cover top plate 210, the upper portion of the vertical portion 612 is fastened to the side of the protrusion 211 by a second screw 640, and the lower portion of the vertical portion 612 is connected to the locking nut 620 by a third screw 650, and the upper end of the grating scale 500 is clamped between the lower portion of the vertical portion 612 and the locking nut 620.

[0057] The lower fixing assembly 700 specifically includes a fourth screw 710 and a fastening plate 720 . The fourth screw 710 passes through the fastening plate 720 and the lower end of the grating ruler 500 to vertically press the lower end of the grating ruler 500 onto the circumferential side plate 320 of the lower end cover.

[0058] For the steel grating scale 500, its upper end is clamped and fixed by the above-mentioned inverted L-shaped connecting block 610 and the locking nut 620, and the lower end is pressed onto the circumferential side plate 320 of the lower end cover by the above-mentioned lower fixing assembly 700. Since the first screw 630 fastened on the horizontal portion 611 of the inverted L-shaped connecting block 610 abuts against the top surface of the protrusion 211 of the upper end cover top plate 210, according to the principle of action and reaction force, the inverted L-shaped connecting block 610 applies an upward tensile force to the grating scale 500 to stretch the grating scale 500, so that the deformation of the grating scale 500 is greater than the deformation of the silicon carbide main body 110 of the Z-axis body 100, and the grating scale 500 can be deformed along with the deformation of the silicon carbide main body 110, thereby improving the measurement accuracy. At the same time, the horizontal portion 611 of the inverted L-shaped connecting block 610 is fastened to the top surface of the protrusion 211 of the upper end cover top plate 210 by a first screw 630, and the upper portion of the vertical portion 612 of the inverted L-shaped connecting block 610 is fastened to the side of the protrusion 211 by a second screw 640, thereby ensuring the installation stability of the inverted L-shaped connecting block 610, and further ensuring the stability and measurement accuracy of the grating scale.

[0059] In some embodiments of the present application, a measuring machine is also proposed, specifically a three-dimensional coordinate measuring machine, including a measuring machine Z axis, which realizes the application of a large-size Z axis in the field of measuring machines. The structure of the measuring machine Z axis can be found in the embodiments of the measuring machine Z axis of the present utility model and the attached Figures 1 to 9 The description will not be repeated here.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A measuring machine Z axis, characterized in that: include: A Z-axis body, the Z-axis body comprising a cylindrical silicon carbide body portion, an annular body upper end cover and an annular body lower end cover, the body upper end cover and the body lower end cover are respectively fixedly connected to the upper and lower ends of the silicon carbide body portion; The upper end cover of the Z-axis is made of metal and is covered on the upper end of the Z-axis body; the upper end cover of the Z-axis includes an upper end cover top plate and an upper end cover circumferential side plate, the upper end cover top plate is fitted and fixedly connected with the upper end cover of the body, and the upper end cover circumferential side plate is fitted and fixedly connected with the upper end of the circumferential side plate of the silicon carbide body; The Z-axis lower end cover is made of metal material and is covered on the upper end of the Z-axis body; the Z-axis lower end cover includes a lower end cover bottom plate and a lower end cover circumferential side plate, the lower end cover bottom plate is fitted and fixedly connected to the lower end of the body lower end cover, and the lower end cover circumferential side plate is fitted and fixedly connected to the lower end of the circumferential side plate of the silicon carbide body.

2. The measuring machine Z axis according to claim 1, characterized in that: The circumferential side plate of the upper end cover is fixedly connected to the upper end of the circumferential side plate of the silicon carbide body through a plurality of fastening components arranged along the circumferential direction, and the fastening components include an internal threaded pin sleeve and a fastening screw; A horizontally penetrating pin sleeve mounting hole is provided on the upper end of the circumferential side plate of the silicon carbide body, and a horizontally penetrating screw mounting hole is correspondingly formed on the circumferential side plate of the upper end cover, the internal threaded pin sleeve is horizontally bonded in the pin sleeve mounting hole, and the fastening screw is horizontally installed in the screw mounting hole and is thread-fastened with the internal threaded pin sleeve; The Z-axis upper end cover and the upper end of the Z-axis body are bonded together by adhesive filled between the two.

3. The measuring machine Z axis according to claim 2, characterized in that: The inner end of the internal threaded pin sleeve is provided with a limiting head, and the limiting head abuts against the inner wall of the circumferential side plate of the silicon carbide body.

4. The measuring machine Z axis according to claim 2, characterized in that: Glue injection holes are arranged on the circumferential side plate of the upper end cover, which are used to inject glue between the upper end cover of the Z-axis and the upper end of the Z-axis body through the glue injection holes.

5. The measuring machine Z axis according to claim 1, characterized in that: The upper end cover of the main body and the lower end cover of the main body are also made of silicon carbide.

6. The measuring machine Z axis according to claim 5, characterized in that: The upper end cover of the main body and the lower end cover of the main body are respectively inlaid with threaded sleeves so as to be respectively screwed to the top plate of the upper end cover and the bottom plate of the lower end cover.

7. The measuring machine Z axis according to claim 1, characterized in that: The measuring machine Z axis also includes a grating ruler assembly, and the grating ruler assembly includes a grating ruler and a reading head; The extension direction of the grating ruler is parallel to the extension direction of the Z-axis body, the upper end of the grating ruler is fixedly connected to the upper end cover of the Z-axis, and the lower end of the grating ruler is fixedly connected to the lower end cover of the Z-axis; The reading head is mounted on the Z-axis slide.

8. The measuring machine Z axis according to claim 7, characterized in that: The upper end of the grating ruler is fixedly connected to the upper end cover of the Z axis through an upper fixing component, and the lower end of the grating ruler is fixedly connected to the lower end cover of the Z axis through a lower fixing component.

9. A measuring machine, characterized in that: A measuring machine Z-axis comprising the Z-axis of any one of claims 1 to 8.

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