CN211136425U - Lead screw strutting arrangement and lathe - Google Patents

Abstract

The utility model provides a screw rod supporting device and a machine tool, which comprise a screw rod support and a connecting shaft; the screw rod support is used for supporting a screw rod in the screw rod transmission pair; the connecting shaft is vertical to the screw rod, and the screw rod support can rotate around the connecting shaft in a circumferential manner; the screw rod support can be separated from the screw rod when a rotary nut combination in the screw rod transmission pair passes through, and the support for the screw rod is restored after the rotary nut combination passes through. The utility model provides a lead screw strutting arrangement and lathe are mainly applicable to the rotatory screw drive system of screw, and safe and reliable has solved the flagging problem that the lead screw level produced when placing the use effectively, can also adjust the holding power between lead screw support and the lead screw to the lead screw supports can not produce the friction with the lead screw, has avoided lead screw temperature rise and lead screw to support the phenomenon appearance of wearing and tearing.

Description

Lead screw strutting arrangement and lathe

Technical Field

The utility model relates to a screw drive field especially relates to a lead screw strutting arrangement and lathe.

Background

With the rapid development of the equipment manufacturing industry, the numerical control machine tool develops towards the direction of large stroke, high speed, high precision and high automation, and the slender screw rod is widely applied to the numerical control machine tool industry. However, when the long and thin screw rod is horizontally placed for use, the screw rod can sag due to factors such as self weight and temperature rise, and the screw rod sags to cause the screw rod to jump during high-speed operation, so that the operation speed and the processing precision of a machine tool are influenced.

At present, the method for solving the drooping of the screw rod mainly comprises a fixed-point supporting mode and a follow-up supporting mode. Sliding friction can occur between the follow-up support and the screw rod, the temperature rise of the screw rod and the abrasion of the supporting block are easily caused, and the servo motor is not suitable for a high-speed machine tool. The fixed point support mainly comprises a mechanical spring support, a pneumatic support, a hydraulic support and the like, wherein the pneumatic and hydraulic supports need more electric and hydraulic control elements, and if the pneumatic and hydraulic elements are aged or failed, the machine tool is collided and a transmission system of the machine tool is damaged. The mechanical spring support has the problems of spring elastic fatigue, large difficulty in supporting force adjustment, easy vibration of the elastic support and the like.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, an object of the present invention is to provide a screw rod supporting device and a machine tool, which solve the problem of the drooping of a horizontal long screw rod.

To achieve the above and other related objects, one embodiment of the present invention provides a lead screw supporting device, which is characterized in that: the screw rod support and the connecting shaft are included; the screw rod support is used for supporting a screw rod in the screw rod transmission pair; the connecting shaft is vertical to the screw rod, and the screw rod support can rotate around the connecting shaft in a circumferential manner; the screw rod support can be separated from the screw rod when a rotary nut combination in the screw rod transmission pair passes through, and the support of the screw rod is restored after the rotary nut combination passes through.

Optionally, the lead screw is supported in a corner structure, and comprises a corner part and two ends extending outwards from the corner part, and the two ends are equal in length; the corner part is rotatably connected with the connecting shaft; the end parts of the two ends are provided with grooves, and the grooves can be clamped with the screw rod.

Optionally, the lead screw support is a right angle structure.

Further: the device also comprises a connecting shaft adjusting structure; the connecting shaft adjusting structure can adjust the relative height of the connecting shaft.

Still further, a spring hold down system is included; the spring pressing system comprises a spring, a spring seat and a supporting base plate, the lower end of the spring is located in the spring seat, the upper end of the spring abuts against the lower surface of the supporting base plate, and the upper surface of the supporting base plate supports the screw rod from the lower side.

Further, the spring pressing system also comprises a spring guide shaft positioned below the supporting base plate; the spring guide shaft comprises a guide rod, and the guide rod is positioned in the inner ring of the spring, extends downwards from the upper end of the spring and extends into the spring seat.

Further, the spring pressing system also comprises a spring adjusting structure; the spring adjustment structure may adjust a degree of compression of the spring relative to the support pad.

Further, the spring compression system comprises at least one linear bearing kinematic pair; the linear bearing kinematic pair comprises a light bar and a linear bearing corresponding to the light bar, and the light bar penetrates through an inner hole of the linear bearing and can move along the inner hole.

The utility model also provides a machine tool, it is vice including the screw drive, the screw drive is vice including lead screw and rotatory screw combination, its characterized in that: further comprising a lead screw support device according to any of the above; the lead screw supporting device supports the lead screw.

Preferably, the bottom of the rotating nut combination is provided with a collision block; the collision block is used for preventing the rotary nut combination from directly colliding the screw rod supporting device.

The utility model provides a lead screw supporting device and a machine tool, which are mainly suitable for a lead screw transmission system for the rotation of a screw nut, are safe and reliable, and effectively solve the problem of drooping when the lead screw is horizontally placed for use; the supporting force between the screw rod support and the screw rod can be conveniently and quickly adjusted by adjusting the position of the spring or the connecting shaft; the lead screw supports the lead screw in a rotating mode, friction can not be generated between the lead screw and the lead screw, and the phenomena of temperature rise of the lead screw and abrasion of the lead screw support are avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a machine tool according to an embodiment of the present invention;

Fig. 2 is a cross-sectional view of a machine tool according to an embodiment of the present invention;

Fig. 3 is a schematic view of an operation state of the screw rod supporting device according to the embodiment of the present invention.

In the figure:

1. Machine tool beam 2, machine tool slide plate 3, rotary screw nut combination

4. Screw rod 5, screw rod seat 6, screw rod support

7. Polished rod 8, linear bearing 9, connecting shaft mounting plate

10. Nut I11, connecting shaft 12, collision block

13. Connecting shaft adjusting block 14, adjusting bolt 15 and spring seat mounting plate

16. Spring seat 17, spring adjusting bolt 18 and hexagon nut

19. Spring backing plate 20, spring 21 and spring guide shaft

22. Support backing plate 23, bearing 24 and nut II

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Fig. 1 shows the structural schematic diagram of the machine tool in the embodiment of the present invention, which includes a screw transmission pair and a screw supporting device, all fixed on the machine tool beam 1. The machine tool cross beam 1 is of a hollow structure, the screw rod transmission pair is fixed above the machine tool cross beam 1, and the screw rod supporting device is installed in the hollow structure of the machine tool cross beam 1.

The screw rod transmission pair comprises a rotary screw nut assembly 3 and a screw rod 4, two screw rod seats 5 are fixed at two ends of the machine tool cross beam 1 along the axial direction, the screw rod 4 is fixed on the machine tool cross beam 1 through the two screw rod seats 5, and the rotary screw nut assembly 3 penetrates through the screw rod 4 and can move back and forth on the screw rod 4. The screw rod transmission pair further comprises a machine tool sliding plate 2, the machine tool sliding plate 2 is mounted on a machine tool cross beam 1 through a guide rail pair, is mutually fixed with the rotary screw nut combination 3 and moves along with the sliding of the rotary screw nut combination 3 on the screw rod 4. As shown in fig. 1, a striking block 12 is fixed at the bottom of the rotary nut assembly 3, and the striking block 12 can move along with the rotary nut assembly 3. The collision block 12 in this embodiment is a plate-shaped structure with a certain length, and the length of the collision block 12 in the axial direction of the screw rod is greater than that of the rotary screw nut assembly 3, so that the collision block 12 receives the force of colliding with the screw rod support 6 in the process that the rotary screw nut assembly 3 moves back and forth along the screw rod 4, and the rotary screw nut assembly 3 is prevented from being worn. Of course, the striking block 12 may be another suitable structure having the above length requirement, such as a cylindrical structure, or a protruding striking block 12 may be provided at each end of the bottom of the rotary nut assembly 3.

The screw rod supporting device comprises a screw rod support 6, a connecting shaft system and a spring pressing system, and openings are formed in positions, corresponding to the components, of the machine tool beam 1 respectively in order to facilitate installation. The screw rod support 6 is positioned right below the screw rod 4 and used for supporting the screw rod 4. As shown in fig. 1, the upper portion of the screw support 6 is exposed from an opening in the upper surface of the machine tool beam 1 and is in contact with the screw 4. The embodiment of the utility model provides an in 6 lead screw supports be a right angle structure, this kind of right angle structure include corner portion and from the outside both ends that extend of corner portion to the distance of both ends to the flex point equals. As shown in fig. 2, two ends of the screw rod support 6 are provided with grooves, the grooves in this embodiment are inverted trapezoids, the size of the inverted trapezoids is larger than the diameter of the screw rod 4 as a whole, and the inverted trapezoids are clamped with the lower surface of the screw rod 4, so that the screw rod support 6 can support the screw rod 4 more stably, and the screw rod 4 can be prevented from shaking or jumping during working. Further, the groove structure can be replaced by other structures which can clamp the screw rod 4 on the premise of not influencing the rotation of the screw rod support 6. The corner part of the screw rod support 6 is provided with a through hole, and two ends of the inner ring of the through hole are respectively provided with a bearing 23. In other embodiments, the lead screw support 6 can be other structures that can function to support the lead screw 4, and such structures can alternately support the lead screw 4 by repeatedly rotating back and forth.

The connecting shaft system comprises a connecting shaft mounting plate 9 and a connecting shaft 11. One end of the connecting shaft 11 penetrates through a through hole of the screw rod support 6, an external thread is arranged on the part extending out of the through hole, and the side extending out of the through hole is locked by a nut II 24. Further, the connecting shaft 11 may be provided with a detent so that the connecting shaft 11 is fixed relative to the lead screw support 6 in the axial direction of the connecting shaft 11, but the lead screw support 6 can still rotate circumferentially around the connecting shaft 11 by means of the bearing 23 in the through hole. As shown in fig. 2, an opening is formed in one side of the machine tool cross beam 1, a connecting shaft mounting plate 9 is mounted at the opening, the other end of the connecting shaft 11 penetrates through a through hole i formed in the connecting shaft mounting plate 9 and extends out of the machine tool cross beam 1, an external thread is formed in the connecting shaft 11 and is fixed on the connecting shaft mounting plate 9 through a nut i 10, and further, the through hole i can be a threaded through hole. The connecting shaft mounting plate 9 is fixed on the machine tool cross beam 1 through bolts arranged at four corners, correspondingly, the connecting shaft mounting plate 9 is provided with four through holes II, and the machine tool cross beam 1 is provided with four threaded holes, so that the connecting shaft 11 and the machine tool cross beam 1 are relatively fixed. Further, in order to adjust the relative height of the connecting shaft 11, it is necessary to adjust the mounting position of the connecting shaft mounting plate 9 relative to the machine tool cross beam 1, and for this purpose, the four through holes ii on the connecting shaft mounting plate 9 may be set to be through holes having a certain length in the vertical direction. When the position of the connecting shaft mounting plate 9 needs to be adjusted, only four fixing bolts need to be loosened, the connecting shaft mounting plate 9 is moved up and down for a certain distance along the vertical direction, the position of the fixing bolt in the through hole II is changed, then the four fixing bolts are screwed, the connecting shaft mounting plate 9 and the machine tool beam 1 can be fixed relatively, and the relative position of the connecting shaft mounting plate and the machine tool beam 1 is changed. Furthermore, the connecting shaft system further comprises a connecting shaft adjusting structure, the connecting shaft adjusting structure comprises a connecting shaft adjusting block 13 and an adjusting bolt 14, and the connecting shaft adjusting block 13 in the embodiment is fixed on the machine tool cross beam 1 below the connecting shaft mounting plate 9. The connecting shaft adjusting block 13 is provided with a threaded hole in the vertical direction, and an adjusting bolt 14 passes through the threaded hole from below and can be adjusted up and down relative to the connecting shaft adjusting block 13. The upper end of the adjusting bolt 14 is abutted against the lower end face of the connecting shaft mounting plate 9, and the position of the connecting shaft mounting plate 9 can be adjusted by adjusting the adjusting bolt 14. Preferably, a blind hole is formed in the lower end face of the connecting shaft mounting plate 9 corresponding to the adjusting bolt 14, and the upper end of the adjusting bolt 14 penetrates through the blind hole to abut against the bottom of the blind hole, so that the relative position relationship between the adjusting bolt 14 and the connecting shaft mounting plate 9 is firmer. As shown in fig. 1, in the present embodiment, the connecting shaft adjusting block 13 is provided with two adjusting bolts 14 in parallel, so that the connecting shaft mounting plate 9 can be adjusted to move up and down more precisely. The connecting shaft adjusting structure can adjust the position of the connecting shaft mounting plate 9 and plays a certain role in supporting and stabilizing the connecting shaft mounting plate 9. Because the connecting shaft 11 is fixed on the connecting shaft mounting plate 9, the relative height of the connecting shaft 11 can be changed along with the change of the position of the connecting shaft mounting plate 9, and because the connecting shaft 11 is relatively fixed with the screw rod support 6, the relative height of the screw rod support 6 is also adjusted.

The spring compression system comprises a spring seat mounting plate 15, a spring seat 16, a spring 20 and a support backing plate 22. As shown in fig. 2, the machine tool cross beam 1 is provided with an opening directly below the screw support 6, and the spring seat mounting plate 15 is fixedly mounted at the opening. Spring holder 16 is the type of falling T structure, including vertical tubular structure that upwards extends and with tubular structure installation department I as an organic whole, installation department I can be circular or other suitable structures, the radial maximum dimension of installation department I is greater than tubular structure's external diameter, the tubular structure upper end is equipped with the opening. Be provided with through-hole III on the spring holder mounting panel 15, the diameter of through-hole III is not less than tubular structure's external diameter, is less than I radial maximum dimension of installation department. The tubular structure of the spring seat 16 penetrates through the through hole from the lower part and extends into the cross beam 1 of the machine tool, and the mounting part I is clamped by the spring seat mounting plate 15. Spring holder 16 and spring holder mounting panel 15 accessible extra fixing bolt reciprocal anchorage, perhaps the III inner walls of through-hole set up the internal thread, and the tubular structure outer wall sets up the external screw thread, through the screw thread reciprocal anchorage. The outer diameter of the spring 20 is smaller than the inner diameter of the cylindrical structure, the length of the spring is larger than the length of the inner cavity of the cylindrical structure, a part of the spring 20 is positioned in the cavity of the cylindrical structure, the upper end extending out of the cylindrical structure is abutted against the lower surface of the supporting base plate 22, and the upper surface of the supporting base plate 22 is abutted against the corner part of the screw rod support 6 and is positioned right below the connecting shaft 11. Generally, the spring 20 of the installed lead screw support device is in a compressed state, so that the support pad 22 can press the lead screw support 6 by the elastic force of the spring 20 to give an upward force to the lead screw support 6. It should be noted that the shape of the support base plate 22 can be designed according to the shape of the screw support 6, and the support base plate 22 can provide positioning for the rotation of the screw support 6 in addition to supporting the screw support 6.

Preferably, a spring guide shaft 21 is fixed to the bottom of the support cushion plate 22, as shown in fig. 2, the spring guide shaft 21 in this embodiment is a T-shaped structure, and includes a mounting portion ii and a guide portion, the mounting portion ii is fixed to the support cushion plate 22 through a fixing bolt, and in this embodiment, since the size of the mounting portion ii is larger than the size of the inner ring of the spring 20, the upper end of the spring 20 abuts against the mounting portion ii. The guide part of the guide shaft 21 is a guide rod with the diameter smaller than the inner diameter of the spring 20, and the guide rod is arranged below the mounting part II and is integrated with the mounting part II. The guide rod is positioned in the inner ring of the spring 20, extends downwards from the upper end of the spring 20 until extending into the inner cavity of the tubular structure of the spring seat 16, and the spring guide shaft 21 is matched with the tubular structure of the spring seat 16 in the compression and release processes of the spring 20, so that the spring 20 always moves along the vertical direction. It is to be noted that the length of the guide bar of the spring guide shaft 21 is smaller than the length of the spring 20. In other embodiments, the spring guide shaft 21 may be a guide rod directly disposed at the bottom of the support pad 22 and integrally formed therewith, the guide rod being located within the inner race of the spring 20. Further, the spring pressing system further comprises a spring adjusting structure, and the spring adjusting structure comprises a spring adjusting bolt 17, a hexagon nut 18 and a spring washer 19. As shown in figure 2, a vertical threaded through hole IV is formed in the mounting part I of the spring seat 16, and a spring adjusting bolt 17 passes through the through hole IV from the lower part, extends into the tubular structure of the spring seat 16 and is locked by a hexagon nut 18. The spring backing plate 19 is located in the inner cavity of the spring seat 16, the lower surface of the spring backing plate abuts against the spring adjusting bolt 17, and the upper surface of the spring backing plate abuts against the lower end of the spring 20. By adjusting the spring adjusting bolt 17, the relative height of the spring backing plate 19 in the inner cavity of the spring seat 16 can be adjusted, and the compression degree of the spring 2 can be adjusted, so that the purpose of adjusting the supporting force of the screw rod support 6 on the screw rod 4 is achieved.

In this embodiment, the spring pressing system further includes a linear bearing kinematic pair, which is a motion guiding direction of the support base plate 22 and ensures that the support base plate 22 keeps moving up and down horizontally and vertically. The linear bearing kinematic pair comprises a light bar 7 and a linear bearing 8 corresponding to the light bar in the vertical direction, as shown in fig. 3, the linear bearing 8 is fixedly mounted on the spring seat mounting plate 15, the upper end of the light bar 7 is fixed on the support base plate 22, the lower end of the light bar 7 penetrates through the linear bearing 8 and can move up and down along the inner hole of the linear bearing 8, and the linear bearing 8 has a certain length in the vertical direction and is used for guiding the movement of the light bar 7. When the light bar 7 moves up and down along with the support pad 22, the light bar 7 moves up and down along the inner hole of the linear bearing 8 at the same time. Preferably, several sets of linear bearing kinematic pairs may be provided around the spring 20, the linear bearing kinematic pairs respectively located at both sides of the spring 20 as shown in fig. 3 providing a more stable movement path in the vertical direction for the support pad 22 and the spring 20.

The preferred embodiment and some variant embodiments of the present invention are described above with reference to fig. 1 to 3, and the following is taken as an example of the above preferred form, and fig. 3 is taken as a schematic diagram to briefly describe the working process of the screw supporting device of the present invention, so as to deepen the understanding of the technical solution of the present invention.

As shown in fig. 3, the moving direction of the rotary nut assembly 3 on the screw rod 4 is from left to right in fig. 3, and the moving direction is the front, and the operation process of the screw rod supporting device is mainly divided into three states in fig. 3. When the striking block 12 in front of the screw assembly 3 is rotated to reach the screw support 6, the screw support 6 is positioned as shown in state 1 in fig. 3, one end of the right-angled structure of the screw support 6 extends vertically upward from the corner portion, and the other end extends horizontally rearward from the corner portion. The upper surface of the supporting base plate 22 presses the screw rod support 6, the screw rod 4 is horizontally erected on the machine tool cross beam 1, and the groove at the vertically upward end of the screw rod support 6 supports the screw rod 4. The rotary screw combination 3 moves forwards on the screw rod 4, when the collision block 12 at the bottom of the rotary screw combination 3 collides with one end of the screw rod support 6 in the vertical direction, the screw rod support 6 rotates clockwise around the connecting shaft 11, and the state 2 in fig. 3 is a schematic diagram when the screw rod support rotates to 45 degrees. Since the screw support 6 rotates without changing the position of the connecting shaft 11, the screw support 6 compresses the support pad 22 to move downward, and the spring 20 is compressed at the same time. During the downward movement of the support base plate 22, the light bars 7 on both sides move downward along the inner holes of the corresponding linear bearings 8, the support base plate 22 is guided without angular deviation during the downward movement, and simultaneously the spring guide shaft 21 moves downward along the inner cavity of the spring seat 16, and the guide spring 20 is compressed in the vertical direction. When the rotation angle of the screw rod support 6 exceeds 45 degrees, the spring 20 is relaxed to release the elastic force, the support cushion plate 22 moves upwards, and the screw rod support 6 continues to rotate. When the collision block 12 continues to move forward, the screw rod support 6 rapidly rotates to a 90-degree state, i.e., state 3 in fig. 3, by means of the elastic force released by the spring 20, at this time, the end of the screw rod support 6, which is originally horizontally placed, becomes vertically upward, the end, which is originally vertically upward, becomes horizontally placed forward, the support base plate 22 continues to press the screw rod support 6, and the screw rod 4 is supported by the vertically upward end of the screw rod support 6. When the rotary screw nut assembly 3 moves backwards, the collision block 12 collides with the screw rod support 6 again to rotate the screw rod support, and the mode of alternately supporting the screw rod 4 by the screw rod support 6 effectively solves the problem that a horizontal long screw rod sags. In other embodiments, a plurality of connecting shaft systems and spring pressing systems can be arranged along the length direction of the lead screw according to requirements to support the lead screw, or the lead screw supporting device can be provided with no spring pressing system, the connecting shaft systems and the lead screw support 6 can also play a role in supporting the lead screw 4 in a matching manner, and the lead screw support 6 can swing back and forth and rotate by utilizing the inertia of the impact block 12 and the self weight.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims (10)

1. The utility model provides a lead screw strutting arrangement which characterized in that:

The screw rod support and the connecting shaft are included;

The screw rod support is used for supporting a screw rod in the screw rod transmission pair;

The connecting shaft is vertical to the screw rod, and the screw rod support can rotate around the connecting shaft in a circumferential manner;

The screw rod support can be separated from the screw rod when a rotary nut combination in the screw rod transmission pair passes through, and the support of the screw rod is restored after the rotary nut combination passes through.

2. The lead screw support device of claim 1, wherein:

The screw rod support is of a corner structure and comprises a corner part and two ends extending outwards from the corner part, and the lengths of the two ends are equal;

The corner part is rotatably connected with the connecting shaft;

The end parts of the two ends are provided with grooves, and the grooves can be clamped with the screw rod.

3. The lead screw support device of claim 2, wherein:

The screw rod support is of a right-angle structure.

4. The lead screw support device of any one of claims 1-3, wherein:

The device also comprises a connecting shaft adjusting structure;

The connecting shaft adjusting structure can adjust the relative height of the connecting shaft.

5. The lead screw support device of claim 1, wherein:

The device also comprises a spring pressing system;

The spring pressing system comprises a spring, a spring seat and a supporting base plate, the lower end of the spring is located in the spring seat, the upper end of the spring abuts against the lower surface of the supporting base plate, and the upper surface of the supporting base plate supports the screw rod from the lower side.

6. The lead screw support device of claim 5, wherein:

The spring pressing system also comprises a spring guide shaft positioned below the supporting base plate;

The spring guide shaft comprises a guide rod, and the guide rod is positioned in the inner ring of the spring, extends downwards from the upper end of the spring and extends into the spring seat.

7. The lead screw support device of claim 5, wherein:

The spring pressing system further comprises a spring adjusting structure;

The spring adjustment structure may adjust a degree of compression of the spring relative to the support pad.

8. The lead screw support device of any one of claims 5-7, wherein:

The spring compression system comprises at least one linear bearing kinematic pair;

The linear bearing kinematic pair comprises a light bar and a linear bearing corresponding to the light bar, and the light bar penetrates through an inner hole of the linear bearing and can move along the inner hole.

9. The utility model provides a machine tool, includes that the screw drive is vice, vice including lead screw and rotatory nut combination of lead screw drive, its characterized in that:

Further comprising a lead screw support device according to any one of claims 1-8;

The lead screw supporting device supports the lead screw.

10. The machine tool of claim 9, wherein:

The bottom of the rotating nut combination is provided with a collision block;

The collision block is used for preventing the rotary nut combination from directly colliding the screw rod supporting device.

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