CN219521390U - Lead screw prestretching mechanism - Google Patents

Abstract

The utility model discloses a screw rod pre-stretching mechanism, which comprises an L-shaped fixing plate, a screw rod, an adjusting nut and a spring, wherein the L-shaped fixing plate is fixed on a base surface, a pre-stretching hole is formed in the vertical part of the L-shaped fixing plate, a bearing group is arranged in the pre-stretching hole, the end part of the screw rod penetrates through the pre-stretching hole, a threaded section is arranged at the end part of the screw rod, the spring is sleeved on the threaded section, the adjusting nut is screwed on the threaded end, the spring is compressed, a rectangular mounting block is connected to the vertical part of the L-shaped fixing plate, the pre-stretching hole is formed in the mounting block, limiting blocks are arranged on two sides of the mounting block, a notch is formed in the vertical part of the L-shaped fixing plate, a limiting groove is formed in the inner side of the notch, and a limiting mechanism is connected between the mounting block and the notch, and the acting force of the spring is controlled by adjusting the position of the adjusting nut on the threaded section, so that a pre-stretching force is provided for the screw rod.

Description

Lead screw prestretching mechanism

Technical Field

The utility model relates to the technical field of lead screw pre-stretching, in particular to a lead screw pre-stretching mechanism.

Background

At present, the working stability of the screw rod directly influences the machining precision of the machine tool. The deformation of the screw rod caused by the temperature rise in the working process of the screw rod leads to the reduction of the machining precision; meanwhile, the screw rod is not firmly installed, deflection and vibration to a certain extent occur, and the machining precision is reduced, so that a reasonable screw rod installation structure is needed, the machining precision of a machine tool is ensured, and the machining quality is improved.

Disclosure of Invention

In order to overcome the defects in the prior art, the embodiment of the utility model provides a screw pre-stretching mechanism to solve the problems in the prior art.

The embodiment of the utility model discloses: the utility model provides a lead screw pretension mechanism, includes L shape fixed plate, lead screw, adjusting nut and spring, L shape fixed plate is fixed on the base surface, L shape fixed plate's vertical portion is equipped with pretension hole, be equipped with the bearing hole in the pretension hole, install the bearing group in the bearing hole, the tip of lead screw passes pretension hole, the tip of lead screw is equipped with the screw thread section, the spring cover is in on the screw thread section, adjusting nut is revolved on the screw thread end, the spring is compressed, be connected with rectangular installation piece on L shape fixed plate's the vertical portion, pretension hole locates on the installation piece, the both sides of installation piece are equipped with the stopper, be equipped with on L shape fixed plate's the vertical portion with the breach that the installation piece matees, the spacing groove is established to the breach inboard, be connected with stop gear between the installation piece with the breach.

Preferably, the stop gear is including locating the spacing hole of installation piece both sides, the vertical portion of L shape fixed plate is equipped with the inner chamber, but the inner chamber is interior to have two gag levers through horizontal slide rail sliding connection, the one end of gag lever levers runs through the inner chamber stretches into in the spacing hole, the bottom of inner chamber is vertical to be equipped with the pivot, be fixed with the gear in the pivot, the intracavity level slidable is equipped with the push rod, the one end of push rod runs through to outside the inner chamber and is connected with the push button, be equipped with on the push rod with gear engagement's rack, the cover has the second spring on the push rod, the both ends of second spring are connected respectively push button with on the relative a pair of face of L shape fixed plate, but the inner chamber is interior to have two L shape poles through horizontal slide rail sliding connection, two L shape poles are with gear central symmetry, be equipped with on the L shape pole with gear engagement's rack, the top of L shape pole is connected the other end of gag lever levers.

Preferably, the bearing group is an angular contact bearing.

Preferably, the spring is a belleville spring.

The beneficial effects of the utility model are as follows: the position of the adjusting nut on the thread section is adjusted to control the acting force of the spring, so that a pretension force is provided for the screw rod; the push button is pushed inwards, the push rod drives the gear to rotate, the two L-shaped rods are driven to be far away from each other, the limiting rod is retracted into the inner cavity, and therefore the mounting block is conveniently taken out, and the mounting block with pretension holes with different diameters is replaced, so that screw rods with different specifications can be adapted.

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.

Drawings

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

Fig. 1 is a schematic view of a part of the structure of a lead screw pretensioning mechanism.

Fig. 2 is a schematic structural view of the limiting mechanism.

Reference numerals of the above drawings: 1. an L-shaped fixing plate; 2. a screw rod; 3. an adjusting nut; 4. a spring; 5. prestretching the hole; 6. a bearing set; 7. a threaded section; 8. a mounting block; 9. a limiting block; 10. a limit groove; 11. a limiting hole; 12. an inner cavity; 13. a limit rod; 14. a rotating shaft; 15. a gear; 16. a push rod; 17. a push button; 18. a rack; 19. a second spring; 20. an L-shaped rod.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, a pre-stretching mechanism for a screw rod 2 comprises an L-shaped fixing plate 1, the screw rod 2, an adjusting nut 3 and a spring 4, wherein the L-shaped fixing plate 1 is fixed on a base surface, a pre-stretching hole 5 is formed in the vertical portion of the L-shaped fixing plate 1, a bearing hole is formed in the pre-stretching hole 5, a bearing group 6 is installed in the bearing hole, the end portion of the screw rod 2 penetrates through the pre-stretching hole 5, a threaded section 7 is formed in the end portion of the screw rod 2, the spring 4 is sleeved on the threaded section 7, the adjusting nut 3 is screwed on the threaded end, the spring 4 is compressed, a rectangular mounting block 8 is connected to the vertical portion of the L-shaped fixing plate 1, the pre-stretching hole 5 is formed in the mounting block 8, limiting blocks 9 are arranged on two sides of the mounting block 8, a notch matched with the mounting block 8 is formed in the vertical portion of the L-shaped fixing plate 1, a limiting groove 10 is formed in the inner side of the notch, and a limiting mechanism is connected between the mounting block 8 and the notch.

The limiting mechanism comprises limiting holes 11 arranged on two sides of an installation block 8, an inner cavity 12 is arranged on the vertical portion of an L-shaped fixing plate 1, two limiting rods 13 are slidably connected in the inner cavity 12 through horizontal sliding rails, one ends of the limiting rods 13 penetrate through the inner cavity 12 and extend into the limiting holes 11, a rotating shaft 14 is vertically arranged at the bottom of the inner cavity 12, a gear 15 is fixed on the rotating shaft 14, a push rod 16 is horizontally slidably arranged in the inner cavity 12, one end of the push rod 16 penetrates out of the inner cavity 12 and is connected with a push button 17, a rack 18 meshed with the gear 15 is arranged on the push rod 16, a second spring 19 is sleeved on the push rod 16, two ends of the second spring 19 are respectively connected to a pair of opposite faces of the push button 17 and the L-shaped fixing plate 1, two L-shaped rods 20 are slidably connected in the inner cavity 12 through horizontal sliding rails and are symmetrical with each other about the center of the gear 15, and the other ends of the L-shaped rods 20 are provided with L-shaped rods 20 which are meshed with racks 18, and the other ends of the L-shaped rods 20 are connected with limiting rods 13.

The bearing group 6 is an angular contact bearing.

The spring 4 is a belleville spring 4.

The working principle of the embodiment of the utility model is as follows: the position of the adjusting nut 3 on the thread section 7 is adjusted to control the acting force of the spring 4, so that a pretensioning force is provided for the screw rod 2; pushing the push button 17 inwards, the push rod 16 drives the gear 15 to rotate, so as to drive the two L-shaped rods 20 to move away from each other, and the limit rod 13 is retracted into the inner cavity 12, so that the mounting block 8 is conveniently taken out, and the mounting block 8 with the pretensioning holes 5 with different diameters is replaced, so that the screw rod 2 with different specifications is adapted.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims (4)

1. A lead screw prestretching mechanism is characterized in that: the novel L-shaped fixing plate comprises an L-shaped fixing plate, a screw rod, an adjusting nut and a spring, wherein the L-shaped fixing plate is fixed on a base surface, a pre-stretching hole is formed in the vertical portion of the L-shaped fixing plate, a bearing hole is formed in the pre-stretching hole, a bearing group is arranged in the bearing hole, the end portion of the screw rod penetrates through the pre-stretching hole, a threaded section is arranged at the end portion of the screw rod, the spring is sleeved on the threaded section, the adjusting nut is screwed on the threaded end, the spring is compressed, a rectangular mounting block is connected to the vertical portion of the L-shaped fixing plate, the pre-stretching hole is formed in the mounting block, limiting blocks are arranged on two sides of the mounting block, a notch matched with the mounting block is formed in the vertical portion of the L-shaped fixing plate, a limiting groove is formed in the inner side of the notch, and a limiting mechanism is connected between the mounting block and the notch.

2. A lead screw pretensioning mechanism according to claim 1, wherein: the utility model discloses a mounting block, including the installation block, the fixed plate is fixed to the fixed plate, stop gear is including locating the spacing hole of installation block both sides, the vertical part of L shape fixed plate is equipped with the inner chamber, but the inner chamber has two gag lever posts through horizontal slide rail sliding connection, the one end of gag lever post runs through the bottom of inner chamber is vertical to be equipped with the pivot, be fixed with the gear in the pivot, the level slidable is equipped with the push rod in the inner chamber, the one end of push rod runs through the inner chamber outward and is connected with the push button, be equipped with on the push rod with gear engagement's rack, the cover has the second spring on the push rod, the both ends of second spring are connected respectively push button with on the relative a pair of L shape fixed plate, but the inner chamber is connected with two L shape poles through horizontal slide rail sliding connection L shape pole, two L shape poles are about gear centrosymmetric, be equipped with on the L shape pole with gear engagement's rack, the top of L shape pole is connected the other end of gag lever.

3. A lead screw pretensioning mechanism according to claim 1, wherein: the bearing group is an angular contact bearing.

4. A lead screw pretensioning mechanism according to claim 1, wherein: the spring is a belleville spring.