Nut pretension force adjusting device

Abstract

The utility model provides a nut pre -tightening force adjusting device, including the shell and the screw rod, the left and right sides of shell all are provided with nut body, nut body and shell all are located the surface of screw rod, be provided with adjusting mechanism in the inner chamber of shell, adjusting mechanism includes mounting block and bolt, four mounting blocks all are located the inner chamber of shell, four mounting block bottom's left and right sides all swing jointly have connecting rod, eight connecting rod's other end all swing jointly have movable block, eight movable block's outside all fixedly installed have moving block, eight moving block's outside all fixedly installed have installation rod, eight installation rods all fixedly installed in two nut body's inside, through setting adjusting mechanism, through the position limiting of nut body, to complete its pre -tightening force adjustment, effectively avoid to improve the stable effect of equipment operation, reduce the nut body and appear the phenomenon that the connection is loose after receiving bigger load.

Description

TECHNICAL FIELD

[0001] The utility model relates to a nut pre -tightening force adjusting device belongs to nut technical field. BACKGROUND

[0002] Ball screw is the ideal product of converting rotary motion into linear motion, or converting linear motion into rotary motion. Ball screw is the most commonly used transmission element in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion, or convert torque into axial repeated force, while having high precision, reversibility and high efficiency. Due to its small friction resistance, ball screw is widely used in various industrial equipment and precision instruments. Ball screw is composed of screw rod, nut, steel ball, pre -pressing piece, reverser and dustproof device. Its function is to convert rotary motion into linear motion, which is the further extension and development of Eickm screw. The important significance of this development is to change the bearing from sliding motion to rolling motion.

[0003] Chinese open patent (open number: CN 215410019 U) discloses a kind of pre -tightening force adjusting mechanism of double-nut ball screw, including screw body, two nuts located screw rod part sliding are arranged at the outer end of screw body, two nuts opposite ends are fixed with clamping assembly, two nut side walls opposite ends are provided with sleeve, two nuts are movably connected with sleeve by clamping assembly, two adjusting assemblies are arranged in the sleeve, adjusting assembly includes base for limiting, base is wedge-shaped, first sliding slot for limiting sliding is formed in the both ends of base side wall, high-pressure spring is fixed on base side wall, and base is fixed with sleeve inner wall by high-pressure spring;The pre -tightening force adjusting mechanism of double-nut ball screw is set by clamping assembly and adjusting assembly, which can limit and force nut, can effectively prevent the phenomenon that nut is loose after being subjected to large load, and improve the stability of equipment;

[0004] The above device mainly relies on the tension of spring to adjust the pre -tightening force of nut, but nut will vibrate in running process, at this time, these vibrations will be transmitted to spring, so that spring is more prone to deformation, so that base will move, thereby affecting the adjustment of nut pre -tightening force, inconvenient for operator to use.

[0005] Therefore, a nut pre -tightening force adjusting device is provided. UTILITY MODEL CONTENTS

[0006] Therefore, the utility model provides a nut pre -tightening force adjusting device to solve or alleviate the technical problems existing in the prior art, at least to provide a beneficial choice.

[0007] The utility model discloses a technical scheme is as follows: a nut pre -tightening force adjusting device, including the casing and the screw rod, the left and right sides of casing all are provided with the nut body, the nut body and casing all are arranged on the surface of screw rod, the inner chamber of casing is provided with adjusting mechanism, adjusting mechanism includes mounting block and bolt, four mounting blocks all are located in the inner chamber of casing, the left and right sides of four mounting block bottom all movably connect with connecting rod, the other end of eight connecting rods all movably connect with movable block, the outside of eight movable blocks all fixedly install with moving block, the outside of eight moving blocks all fixedly install with mounting rod, eight mounting rods all fixedly install in the inner side of two nut bodies.

[0008] Further preferably, the size of the inner side of the two nut bodies matches the size of the inner cavity of the casing, and the two nut bodies are both slidingly connected in the inner cavity of the casing.

[0009] Further preferably, the inner side of the two nut bodies is provided with a thread groove, and the two nut bodies are both threadedly connected to the surface of the screw rod.

[0010] Further preferably, the four bolts are movably connected to the outside of the four mounting blocks, and the surface of the four bolts is provided with a cross groove.

[0011] Further preferably, the casing is provided with a notch around the top, and the four bolts are threadedly connected to the inner cavity of the four notches and extend into the inner cavity of the casing.

[0012] Further preferably, the inner cavity of the casing is fixedly installed with a limiting frame, and the four mounting blocks are slidingly connected to the surface of the four limiting frames.

[0013] Further preferably, the left and right sides of the inner cavity of the casing are provided with a moving groove, and the outside of the eight moving blocks is slidingly connected in the inner cavity of the eight moving grooves.

[0014] Further preferably, the left and right sides of the casing are fixedly installed with a sealing ring, and the material of the sealing ring is rubber.

[0015] The utility model discloses an embodiment has the following advantages due to the adoption of the above technical scheme:

[0016] Firstly, the adjusting mechanism is arranged, and the mounting block moves synchronously with the nut body driven by the mounting rod through the cooperation of the connecting rod under the pushing of the bolt, the position of the nut body is limited, the pre-tightening force is adjusted, the stability of the equipment operation is improved, and the phenomenon of loose connection of the nut body under a large load is reduced.

[0017] The utility model discloses a bolt and cross groove are set up, can conveniently adjust the length that bolt extends downward freely through screwdriver to the spacing of nut body is completed to the adjustment work of nut body spacing, through setting the notch, can be positioned to the movement of bolt, avoid the direction change when bolt extends to the inside, thereby influence to the adjustment of nut body pre -tension, through setting the limiting frame, can be positioned to the movement of mounting block, avoid the direction change when mounting block moves, thereby influence to the adjustment of nut body pre -tension, through setting the movement groove, can be positioned to the movement of moving block, avoid the direction change when moving block moves, thereby influence to the adjustment of nut body pre -tension, through setting the sealing ring, can avoid dust through the connecting place of nut body and shell and enter the inner chamber of shell, lead to the part in the inner chamber of shell and appear the situation of jam because of the influence of dust.

[0018] The above summary is merely intended to illustrate the present description and is not intended to limit in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be apparent from the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 It is a schematic diagram of the three-dimensional front view structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the internal structure of the shell of the utility model;

[0022] Figure 3 It is the utility model's Figure 1 It is a schematic diagram of the enlarged structure at A;

[0023] Figure 4 It is the utility model's Figure 2 It is a schematic diagram of the enlarged structure at B;

[0024] Figure 5 It is the utility model's Figure 2 It is a schematic diagram of the enlarged structure at C.

[0025] Reference numerals: 1. Housing; 2. Adjustment mechanism; 201. Mounting block; 202. Connecting rod; 203. Movable block; 204. Moving block; 205. Mounting rod; 206. Bolt; 207. Cross groove; 208. Groove; 209. Limiting bracket; 210. Moving groove; 3. Nut body; 4. Lead screw; 5. Sealing ring. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figures 1-5 As shown, this utility model embodiment provides a nut preload adjustment device, including a housing 1 and a lead screw 4. Nut bodies 3 are provided on both the left and right sides of the housing 1. The nut bodies 3 and the housing 1 are both located on the surface of the lead screw 4. An adjustment mechanism 2 is provided in the inner cavity of the housing 1. The adjustment mechanism 2 includes mounting blocks 201 and bolts 206. Four mounting blocks 201 are located in the inner cavity of the housing 1. Connecting rods 202 are movably connected to the left and right sides of the bottom of the four mounting blocks 201. Movable blocks 203 are movably connected to the other ends of the eight connecting rods 202. Moving blocks 204 are fixedly installed on the outer side of the eight moving blocks 203. Mounting rods 205 are fixedly installed on the outer side of the eight moving blocks 204. The eight mounting rods 205 are fixedly installed on the inner side of the two nut bodies 3. The dimensions of the inner side of the two nut bodies 3 match the dimensions of the inner cavity of the housing 1. The two nut bodies 3 are slidably connected to the inner cavity of the housing 1. The inner side of the two nut bodies 3 has a threaded groove. The two nut bodies 3 are threadedly connected to the surface of the lead screw 4.

[0030] By setting the adjustment mechanism 2, the bolt 206 pushes the mounting block 201, which, with the cooperation of the connecting rod 202, causes the mounting rod 205 to drive the nut body 3 to move synchronously. By limiting the position of the nut body 3, the preload is adjusted, which effectively avoids and improves the stability of the equipment operation and reduces the phenomenon of loosening of the connection after the nut body 3 is subjected to a large load.

[0031] Example 2

[0032] like Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, in one embodiment, the four bolts 206 are movably connected to the outer side of the four mounting blocks 201, the surface of the four bolts 206 is provided with a cross groove 207, the periphery of the top of the shell 1 is provided with a slot 208, the four bolts 206 are threadedly connected to the inner cavity of the four slots 208 and extend into the inner cavity of the shell 1, the inner cavity of the shell 1 is fixedly installed with a limiting frame 209, the four mounting blocks 201 are movably connected to the surface of the four limiting frames 209, the left and right sides of the inner cavity of the shell 1 are provided with a moving groove 210, the outer side of the eight moving blocks 204 is movably connected to the inner cavity of the eight moving grooves 210, and the left and right sides of the shell 1 are fixedly installed with a sealing ring 5, and the material of the sealing ring 5 is rubber.

[0033] By setting the bolt 206 and the cross groove 207, the length of the bolt 206 extending downward can be freely adjusted by a screwdriver, thereby completing the adjustment of the distance between the nut bodies 3, by setting the slot 208, the movement of the bolt 206 can be limited, so that the direction of the bolt 206 extending inward is prevented from changing, thereby affecting the adjustment of the pretightening force of the nut body 3, by setting the limiting frame 209, the movement of the mounting block 201 can be limited, so that the direction of the mounting block 201 is prevented from changing when moving, thereby affecting the adjustment of the pretightening force of the nut body 3, by setting the moving groove 210, the movement of the moving block 204 can be limited, so that the direction of the moving block 204 is prevented from changing when moving, thereby affecting the adjustment of the pretightening force of the nut body 3, and by setting the sealing ring 5, dust entering the inner cavity of the shell 1 through the connection between the nut body 3 and the shell 1 can be avoided, so that the parts in the inner cavity of the shell 1 are prevented from being affected by dust and being jammed.

[0034] In the working process of the utility model, the bolt 206 is rotated by the external screwdriver, the mounting block 201 is moved by the bolt 206, the connecting rod 202 swings and synchronously drives the movable block 203 to move, the moving block 204 moves synchronously with the movable block 203, the mounting rod 205 moves synchronously, the nut body 3 moves synchronously with the mounting rod 205, and the adjustment of the pretightening force of the nut body 3 is completed.

[0035] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of various changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A nut pretensioning device comprising a housing (1) and a screw spindle (4), characterized in that The left and right sides of the shell (1) are provided with nut bodies (3), the nut bodies (3) and the shell (1) are provided on the surface of the screw rod (4), the inner cavity of the shell (1) is provided with an adjusting mechanism (2), the adjusting mechanism (2) comprises a mounting block (201) and a bolt (206), four mounting blocks (201) are located in the inner cavity of the shell (1), the left and right sides of the bottom of the four mounting blocks (201) are movably connected with connecting rods (202), the other ends of the eight connecting rods (202) are movably connected with movable blocks (203), the outer sides of the eight movable blocks (203) are fixedly connected with moving blocks (204), the outer sides of the eight moving blocks (204) are fixedly connected with mounting rods (205), and the eight mounting rods (205) are fixedly connected to the inner sides of the two nut bodies (3).

2. A nut pretensioning device according to claim 1, characterized in that: The sizes of the inner sides of the two nut bodies (3) are matched with the size of the inner cavity of the shell (1), and the two nut bodies (3) are movably connected in the inner cavity of the shell (1).

3. A nut pretensioning device according to claim 1, characterized in that: The inner sides of the two nut bodies (3) are provided with thread grooves, and the two nut bodies (3) are threadedly connected to the surface of the screw rod (4).

4. The nut pretensioning device according to claim 1, characterized in that: The four bolts (206) are movably connected to the outer sides of the four mounting blocks (201), and the surfaces of the four bolts (206) are provided with cross grooves (207).

5. A nut pretensioning device according to claim 4, characterized in that: The top of the shell (1) is provided with notches (208) around, and the four bolts (206) are threadedly connected to the inner cavities of the four notches (208) and extend into the inner cavity of the shell (1).

6. A nut pretensioning device according to claim 1, characterized in that: The inner cavity of the shell (1) is fixedly connected with a limiting frame (209), and the four mounting blocks (201) are movably connected to the surface of the four limiting frames (209).

7. The nut pretensioning device according to claim 1, characterized in that: The left and right sides of the inner cavity of the shell (1) are provided with moving grooves (210), and the outer sides of the eight moving blocks (204) are movably connected in the inner cavities of the eight moving grooves (210).

8. The nut pretensioning device according to claim 1, characterized in that: The left and right sides of the shell (1) are fixedly connected with sealing rings (5), and the material of the sealing ring (5) is rubber.

Images