Device for eliminating idle stroke of lead screw nut

Abstract

The utility model provides a device for eliminating idle stroke of a lead screw nut. The device comprises a sliding seat, a sliding plate arranged at the top of the sliding seat, a horizontal lead screw arranged below the sliding plate, the lead screw nut matched with the horizontal lead screw, a pair of oil cylinders arranged between the sliding plate and the horizontal lead screw, and a first support and a second support which are arranged at the two ends of the pair of oil cylinders. The pair of oil cylinders are arranged on the inner side and the outer side of the lower portion of the sliding plate respectively, each oil cylinder comprises a horizontal cylinder barrel with the two ends open, a piston arranged in the horizontal cylinder barrel in a sleeved mode and an end nut arranged at the rear side end of the horizontal cylinder barrel, an oil inlet is formed in the middle of each end nut, and a vertical cylindrical pin is arranged at the position, above the front side end of each piston, of the bottom of the sliding plate. The front side end of the piston abuts against the cylindrical pin, and the top of the lead screw nut penetrates through the position between the pair of oil cylinders and is connected with the sliding plate. According to the device, force is constantly applied to one direction of a sliding table through a pair of oil cylinders, and the idle stroke amount of a lead screw nut is eliminated; and the structure is simple and the assembly is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of precision machining, and in particular relates to a device for eliminating the idle stroke of a lead screw nut. Background Art

[0002] There is a certain gap between the lead screw and the lead screw nut of the ordinary T-type lead screw used in the prior art. Because of this gap, during the transmission process, when the lead screw rotates in the opposite direction, the lead screw nut has a short distance that does not move, which is called the idle stroke. When the T-type lead screw is used for positioning transmission, the idle stroke will affect the positioning accuracy. Therefore, when the T-type lead screw is used for positioning transmission, how to eliminate the idle stroke is a technical problem that needs to be solved. Utility Model Content

[0003] In view of the above problems, the utility model provides a device for eliminating the idle stroke of a lead screw nut.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is: a device for eliminating the idle travel of a lead screw nut, comprising a slide, a slide plate arranged on the top of the slide, a horizontal lead screw arranged below the slide plate, a lead screw nut arranged at the bottom of the slide plate and threadedly matched with the horizontal lead screw, a pair of oil cylinders arranged between the slide plate and the horizontal lead screw, and a first bracket and a second bracket for supporting both ends of the pair of oil cylinders; wherein,

[0005] The pair of oil cylinders are respectively arranged at the inner and outer sides below the slide plate, and the oil cylinders are slender oil cylinders along the moving direction of the slide plate, including a horizontal cylinder barrel with openings at both ends, a piston sleeved on the inner side of the horizontal cylinder barrel and matched with the horizontal cylinder barrel, and an end nut arranged at the rear end of the horizontal cylinder barrel, and an oil inlet is opened in the middle of the end nut; oil is filled between the rear end of the piston and the rear end of the horizontal cylinder barrel, and a vertical cylindrical pin is provided at the bottom of the slide plate above the front end of the piston, and the front end of the piston extending out of the horizontal cylinder barrel abuts against the cylindrical pin;

[0006] The horizontal lead screw is located below a pair of the oil cylinders, and the top of the lead screw nut passes through a pair of the oil cylinders and is connected to the slide plate.

[0007] The utility model is further configured that the lead screw nut is a half nut.

[0008] The utility model is further configured such that a pair of first horizontal through holes are provided at both inner and outer ends of the first bracket for the rear ends of the horizontal cylinder barrels of a pair of oil cylinders to pass through, and a pair of second horizontal through holes corresponding to the first horizontal through holes are provided at both inner and outer ends of the second bracket for the front ends of the horizontal cylinder barrels of the pair of oil cylinders to be inserted.

[0009] The utility model is further configured such that the first bracket is a C-shaped bracket opening downward, comprising a horizontal plate and a pair of positioning columns vertically arranged at both ends of the horizontal plate, and the first horizontal through hole is opened on the positioning columns.

[0010] The utility model is further configured such that the second bracket includes a support plate and a pair of supports arranged at the rear side end of the support plate; wherein the support plate is a C-shaped plate with an opening facing backward, a pair of supports are respectively arranged at the inner and outer ends of the C-shaped plate, a second horizontal through hole corresponding to the first horizontal through hole is opened on the support, and the second horizontal through hole is opened on the support.

[0011] The utility model is further configured such that the level of the bottom surface of the second horizontal through hole is lower than the level of the upper surface of the support plate.

[0012] The utility model is further configured such that a horizontal hollow distance between the first bracket and the second bracket between a pair of the oil cylinders matches a moving distance of the lead screw nut.

[0013] The utility model is further configured as follows: the horizontal cylinder includes a main body section, and positioning sections inserted into the first bracket and the second bracket at both ends of the main body section, the outer diameter of the main body section is larger than the outer diameter of the positioning section; the end nut is sleeved on the horizontal cylinder through a threaded connection, an annular gasket is sandwiched between the rear side surface of the first bracket and the front side surface of the end nut, and the front side surface of the first bracket and the rear side surface of the main body section are abutted against each other.

[0014] The beneficial effects of the utility model are as follows: the device of the utility model utilizes the pressure of oil pressure to constantly apply force to one direction of the slide table through two slender oil cylinders, thereby ensuring that the threads between the lead screw nut and the lead screw always maintain one-way contact, thereby achieving the purpose of eliminating the idle travel of the lead screw nut; and the device has a simple structure and is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of the device for eliminating the lost motion of the screw nut according to the utility model.

[0016] Figure 2 for Figure 1 Schematic cross-section of the middle oil cylinder.

[0017] Figure 3 1 is a top view of the first bracket and the second bracket in the embodiment.

[0018] Figure 4 It is a right side view of the first bracket in the embodiment.

[0019] Figure 5 FIG. 4 is a top view of the second bracket in the embodiment.

[0020] Figure 6 for Figure 5 Right view of .

[0021] Figure 7 It is a cross-sectional view of the horizontal cylinder described in the embodiment.

[0022] Figure 8 for Figure 2 Magnified view of area A.

[0023] Among them: 1. slide plate, 2. horizontal lead screw, 3. lead screw nut, 4. oil cylinder, 41. horizontal cylinder barrel, 411. positioning section, 412. middle section, 42. piston, 43. end nut, 44. oil inlet, 5. first bracket, 51. horizontal plate, 52. positioning column, 53. first horizontal through hole, 6. second bracket, 61. support plate, 62. support, 63. second horizontal through hole, 7. slide seat, 8. cylindrical pin, 9. annular pad. DETAILED DESCRIPTION

[0024] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0025] In the description of the present invention, it should be understood that the terms "center", "axial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] like Figure 1 and Figure 2 As shown, the utility model discloses a device for eliminating the idle stroke of a lead screw nut 3, comprising a slide seat 7, a slide plate 1 arranged on the top of the slide seat 7, a horizontal lead screw 2 arranged below the slide plate 1, a lead screw nut 3 arranged at the bottom of the slide plate 1 and threadedly matched with the horizontal lead screw 2, a pair of oil cylinders 4 arranged between the slide plate 1 and the horizontal lead screw 2, and a first bracket 5 and a second bracket 6 for supporting the front and rear ends of the pair of oil cylinders 4; wherein,

[0027] The pair of oil cylinders 4 are respectively arranged at the inner and outer sides below the slide plate 1. The oil cylinder 4 is an elongated oil cylinder along the moving direction of the slide plate, including a horizontal cylinder barrel 41 with openings at both ends, a piston 42 sleeved in the horizontal cylinder barrel 41 and matched with the horizontal cylinder barrel 41, and an end nut 43 arranged at the rear end of the horizontal cylinder barrel 41. An oil inlet 44 is opened in the middle of the end nut 43, and the oil inlet is connected to an oil pump (not shown in the figure) on the outside; oil is filled between the rear end of the piston 42 and the rear end of the horizontal cylinder barrel 41, and a vertical cylindrical pin 8 is provided at the bottom of the slide plate 1 above the front end of the piston 42, and the front end of the piston 42 extending out of the horizontal cylinder barrel 41 abuts against the cylindrical pin 8;

[0028] The horizontal lead screw 2 is located below a pair of the oil cylinders 4 , and the top of the lead screw nut 3 passes through a pair of the oil cylinders 4 and is connected to the slide plate 1 .

[0029] In this embodiment, the lead screw nut 3 is a half nut, which is easy to disassemble.

[0030] like Figures 3 to 6 As shown, the first bracket 5 is a C-shaped bracket with an opening downward, comprising a horizontal plate 51 and a pair of positioning posts 52 vertically arranged at both ends of the horizontal plate 51. The vertical height of the positioning posts 52 is greater than the thickness of the horizontal plate 51. The positioning posts 52 are provided with a first horizontal through hole 53 along the moving direction of the slide plate for the rear end of the horizontal cylinder 41 to pass through. In this embodiment, the horizontal plate 51 and the positioning posts 52 at both ends are fixed by welding.

[0031] The second bracket 6 includes a support plate 61 and a pair of supports 62 provided at the rear end of the support plate 61; wherein the support plate 61 is a C-shaped plate with an opening facing backward, and a pair of supports 62 are provided at the inner and outer ends of the C-shaped plate, respectively; a second horizontal through hole 63 corresponding to the first horizontal through hole 53 is provided on the support 62, and the front end of the horizontal cylinder 41 is inserted into the second horizontal through hole 63. In this embodiment, the support 62 is fixed to the support plate 61 by welding, and the horizontal height of the bottom surface of the second horizontal through hole 63 is lower than the horizontal height of the upper surface of the support plate 61; the front end of the horizontal cylinder 41 is inserted into the second horizontal through hole 63 and abuts against the support plate 61

[0032] In this embodiment, the horizontal hollow distance between the first bracket 5 and the second bracket 6 between a pair of cylinders 4 matches the moving distance of the screw nut 3 to avoid interference with the stroke of the skateboard 1 caused by the setting of the horizontal cylinder 41 and the first bracket 5 and the second bracket 6.

[0033] Furthermore, if Figure 7 and Figure 8As shown, the horizontal cylinder 41 includes a main body section 412 and positioning sections 411 inserted into the first bracket 5 and the second bracket 6 at both ends of the main body section 412. The outer diameter of the main body section 412 is larger than the outer diameter of the positioning section 411, and the inner diameter of the main body section 412 is equal to the inner diameter of the positioning section 411. The end nut 43 is sleeved on the rear end of the horizontal cylinder 41 through a threaded connection. An annular pad 9 is sandwiched between the rear side of the first bracket 5 and the front side of the end nut 43. The front side of the first bracket 5 and the rear side of the main body section 412 are against each other. This arrangement is used to prevent the oil in the oil cylinder from leaking, while ensuring the positioning of the horizontal cylinder 41 to prevent it from moving horizontally along the moving direction of the slide.

[0034] The device of the utility model utilizes the pressure of oil pressure to constantly apply force to one direction of the slide plate through a pair of oil cylinders, thereby ensuring that the threads between the lead screw nut 3 and the lead screw always maintain one-way contact, thereby eliminating the idle stroke of the lead screw nut 3. When oil with a certain pressure enters the oil cylinder 4 through the oil inlet, the oil pressure always pushes the piston 42 and the horizontal cylinder 41 in two opposite directions, because the front end of the piston 42 presses on the cylindrical pin 8 installed on the slide plate 1, and the horizontal cylinder 41 is fixed on the bracket installed on the slide seat 7, so that the lead screw nut 3 fixed on the slide plate 1 and the lead screw fixed on the slide seat 7 always maintain one-way contact.

[0035] The above embodiments are only used to help understand the method and core idea of ​​the utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A device for eliminating the backlash of a lead screw nut, characterized in that: It includes a slide seat, a slide plate arranged on the top of the slide seat, a horizontal lead screw arranged below the slide plate, a lead screw nut arranged at the bottom of the slide plate and threadedly matched with the horizontal lead screw, a pair of oil cylinders arranged between the slide plate and the horizontal lead screw, and a first bracket and a second bracket for supporting both ends of the pair of oil cylinders; wherein, The pair of oil cylinders are respectively arranged at the inner and outer sides below the slide plate, and the oil cylinders are slender oil cylinders along the moving direction of the slide plate, including a horizontal cylinder barrel with openings at both ends, a piston sleeved on the inner side of the horizontal cylinder barrel and matched with the horizontal cylinder barrel, and an end nut arranged at the rear end of the horizontal cylinder barrel, and an oil inlet is opened in the middle of the end nut; oil is filled between the rear end of the piston and the rear end of the horizontal cylinder barrel, and a vertical cylindrical pin is provided at the bottom of the slide plate above the front end of the piston, and the front end of the piston extending out of the horizontal cylinder barrel abuts against the cylindrical pin; The horizontal lead screw is located below a pair of the oil cylinders, and the top of the lead screw nut passes through a pair of the oil cylinders and is connected to the slide plate.

2. A device for eliminating lost motion of a lead screw nut according to claim 1, characterized in that: A pair of first horizontal through holes are formed at both inner and outer ends of the first bracket for the rear ends of the horizontal cylinder barrels of the pair of oil cylinders to pass through, and a pair of second horizontal through holes corresponding to the first horizontal through holes are formed at both inner and outer ends of the second bracket for the front ends of the horizontal cylinder barrels of the pair of oil cylinders to be inserted into.

3. A device for eliminating lost motion of a lead screw nut according to claim 2, characterized in that: The first bracket is a C-shaped bracket opening downward, comprising a horizontal plate and a pair of positioning columns vertically arranged at both ends of the horizontal plate, and the first horizontal through hole is formed on the positioning columns.

4. A device for eliminating lost motion of a lead screw nut according to claim 2, characterized in that: The second bracket includes a support plate and a pair of supports arranged at the rear end of the support plate; wherein the support plate is a C-shaped plate with an opening facing backward, a pair of supports are respectively arranged at the inner and outer ends of the C-shaped plate, a second horizontal through hole corresponding to the first horizontal through hole is opened on the support, and the second horizontal through hole is opened on the support.

5. The device for eliminating lost motion of a lead screw nut according to claim 4, characterized in that: The level of the bottom surface of the second horizontal through hole is lower than the level of the upper surface of the support plate.

6. The device for eliminating lost motion of a lead screw nut according to claim 1, characterized in that: The horizontal hollow distance between the first bracket and the second bracket between a pair of the oil cylinders matches the moving distance of the lead screw nut.

7. The device for eliminating lost motion of a lead screw nut according to claim 1, characterized in that: The horizontal cylinder includes a main body section and positioning sections inserted into the first bracket and the second bracket at both ends of the main body section, the outer diameter of the main body section is larger than the outer diameter of the positioning section; the end nut is sleeved on the horizontal cylinder through a threaded connection, an annular pad is sandwiched between the rear side surface of the first bracket and the front side surface of the end nut, and the front side surface of the first bracket and the rear side surface of the main body section are abutted against each other.

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