Ball screw nut pair steel ball assembling jig

Abstract

The utility model discloses a ball screw nut pair steel ball assembling jig which comprises a dummy shaft and a trapezoid screw rod, one end of the dummy shaft is used for being movably assembled with the inner wall of a ball nut, and the other end of the dummy shaft is fixedly connected to the trapezoid screw rod. The device further comprises a rotating nut seat, the rotating nut seat is movably arranged on the trapezoidal lead screw in a sleeving mode so that the rotating nut seat can do reciprocating motion on the trapezoidal lead screw, and one end of the rotating nut seat is provided with an abutting part abutting against the ball nut. The steel ball assembling device achieves steel ball assembling of the lead screw nut, and has the advantages of being simple in structure, easy to operate, capable of enabling a green operator to rapidly operate, capable of improving assembling efficiency and meanwhile capable of guaranteeing the consistency of the number of the assembled steel balls.

Description

Technical Field

[0001] The utility model relates to the field of assembly of ball screw nut pairs, in particular to a steel ball assembly fixture device of a ball screw nut pair. Background Art

[0002] The function of the ball screw nut pair is to convert rotational motion into linear motion. It is one of the most widely used transmission devices in CNC machine tools. In the process of assembling the steel ball of the ball screw nut pair, the steel ball needs to be installed in the thread groove between the nut and the screw, and the ball nut is put on one end of the screw, and then the steel ball is placed in the thread gap between the thread groove on the inner wall of the ball nut and the screw, and the ball nut or screw is rotated at the same time, so that the steel ball is rotated into the thread gap between the ball nut and the screw.

[0003] In the prior art, a Chinese utility model patent with authorization announcement number: CN219152045U discloses a steel ball assembly device for a screw nut, the assembly device includes a base, the base has a accommodating cavity, a spring and a movable block are installed in the accommodating cavity, the upper part of the movable block is provided with a guide column and extends above the base, the lower part is supported by the spring, and the position relationship between the guide column and the ball nut is controlled by squeezing the movable block connected to the spring to achieve the assembly task of the ball nut steel ball. The device improves the assembly efficiency of the steel ball and solves the problem of inconvenient assembly. However, during the assembly process of the device, it is difficult for the operator to grasp the compression degree of the spring so that the relative position of the guide column and the ball nut cannot be accurately controlled. In addition, during the steel ball assembly process, the movable block needs to be pressed all the time and both hands can only be freed after the ball nut is transferred to the screw. Therefore, the device still needs to be improved to make it more reasonable. Utility Model Content

[0004] In view of the problems raised in the above background technology: it is difficult to grasp the compression degree of the spring and thus cannot accurately control the relative position of the guide column and the ball nut, and the movable block needs to be pressed all the time during the steel ball assembly process and both hands cannot be freed. The utility model provides a ball screw nut pair steel ball assembly fixture, which can easily realize the precise control of the relative position of the dummy shaft and the ball nut, prevent the steel balls from falling during the steel ball assembly process, and free both hands at any time during the assembly process, and allow novice operators to quickly get started, greatly improving the assembly efficiency of the steel balls.

[0005] In view of the shortcomings of the above technologies, the following solutions are proposed:

[0006] The utility model discloses a steel ball assembly jig for a ball screw nut pair, comprising a dummy shaft and a trapezoidal screw, wherein one end of the dummy shaft is used for movably assembling with the inner wall of the ball nut, and the other end is fixedly connected to the trapezoidal screw; the utility model also comprises a rotating nut seat, wherein the rotating nut seat is movably sleeved on the trapezoidal screw so as to enable the rotating nut seat to reciprocate on the trapezoidal screw, and one end of the rotating nut seat is provided with an abutting portion abutting with the ball nut.

[0007] As an improved solution of the utility model, the connecting surface between the dummy shaft and the ball nut is a smooth surface.

[0008] As an improved solution of the utility model, the other end of the dummy shaft is provided with an external thread structure, the inner wall of the trapezoidal screw cavity is provided with an internal thread structure, and the external thread structure and the internal thread structure are adaptively connected.

[0009] As an improved solution of the utility model, it also includes a nut sleeve movably mounted on one end of the smooth surface of the false shaft, one side of the nut sleeve is provided with a groove for accommodating the ball nut, and the other side abuts against the abutment portion.

[0010] As an improved solution of the utility model, it also includes a ball taking plate for taking steel balls, and one end of the ball taking plate is provided with circular grooves arranged in a matrix.

[0011] As an improved solution of the utility model, it also includes a funnel, and the funnel cooperates with the ball taking plate to carry the steel ball into the inner cavity of the ball nut.

[0012] As an improved solution of the utility model, the outer surface of the rotating nut seat is provided with a rough contact surface with staggered stripes.

[0013] As an improved solution of the utility model, it also includes a bottom plate for being placed on a plane, and the bottom plate is connected to an end of the trapezoidal lead screw away from the dummy shaft.

[0014] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model discloses a ball assembly fixture for a ball screw nut pair, comprising a dummy shaft and a trapezoidal screw, one end of the dummy shaft is used for movably assembling with the inner wall of the ball nut, and the other end is fixedly connected to the trapezoidal screw; it also comprises a rotating nut seat, the rotating nut seat is movably sleeved on the trapezoidal screw so that the rotating nut seat can reciprocate on the trapezoidal screw, one end of the rotating nut seat is provided with an abutting portion abutting with the ball nut, and the advantage is that it can accurately The relative position of the ball nut and the dummy shaft can be controlled, and during the operation, the rotating nut seat only needs to be rotated according to the specific assembly situation of the steel balls to continuously adjust the position relationship between the dummy shaft and the ball nut, so both hands can be freed at any time during the operation. The device has a simple structure and is easy to operate, which allows novice operators to quickly get started and improve the assembly efficiency of the steel balls. A matrix-arranged steel ball groove is set at one end of the ball taking plate, so the number of steel balls taken can be clearly observed. The ball taking plate is used in conjunction with the funnel, which facilitates the taking and placing of steel balls while ensuring the consistency of the number of assembled steel balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded view of the utility model.

[0016] Figure 2 It is a front view of the utility model.

[0017] Figure 3 It is a cross-sectional view of the utility model.

[0018] Figure 4 Detailed view of the selected area of ​​the cross section of the present invention.

[0019] The symbols of the main components are explained as follows: 1. dummy shaft; 2. rotating nut seat; 3. ball nut; 4. trapezoidal screw; 5. circular bottom plate; 6. funnel; 7. ball removal plate; 8. nut sleeve. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0021] The following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Please see attached Figure 1 To Attachment Figure 4, a ball screw nut pair steel ball assembly jig, including a dummy shaft 1 and a trapezoidal screw 4, one end of the dummy shaft 1 is used for movably assembling with the inner wall of the ball nut 3, and the other end is fixedly connected to the trapezoidal screw 1; it also includes a rotating nut seat 2, the rotating nut seat 2 is movably sleeved on the trapezoidal screw 4 so that the rotating nut seat 2 can reciprocate on the trapezoidal screw 4, and one end of the rotating nut seat 2 is provided with an abutment portion that abuts against the ball nut 3. The utility model is a jig for assembling 3 steel balls for the ball nut, and the ball nut 3 is driven to move by rotating the rotating nut seat 2 so that the dummy shaft 1 and the ball nut 3 reach the required position for steel ball assembly.

[0023] Please see attached Figure 3 In the process of assembling the steel balls, in order to allow the dummy shaft 1 to abut against the steel balls inside the ball nut 3 and keep the dummy shaft 1 in a fixed position, in the present embodiment, one end of the dummy shaft 1 is set to a smooth surface, and one end of the smooth surface of the dummy shaft 1 is used to abut against the steel balls in the internal cavity of the ball nut 3 to prevent the steel balls from falling. At the same time, the smooth surface can reduce the friction between the surface and the steel balls. An external thread structure is set at the other end to be connected and fixed in a rotational manner with the internal thread structure of the inner wall of the cavity of the trapezoidal screw rod 4. At the same time, the trapezoidal screw rod 4 is fixed to the circular bottom plate 5. At this time, the dummy shaft 1, the trapezoidal screw rod 4 and the circular bottom plate 5 form a fixed structure, which can maintain a fixed position during the process of assembling the steel balls, thereby facilitating the assembly of the steel balls of the ball nut 3.

[0024] Please see attached Figure 3 In order to allow the ball nut 3, the dummy shaft 1 and the nut sleeve 8 to be adaptably connected, in the present embodiment, a nut sleeve 8, a dummy shaft 1 and a ball taking plate 7 matching the ball nut 3 are provided, the ball nut 3 is placed in the accommodating cavity of the nut sleeve 8, and one end of the smooth surface of the dummy shaft 1 passes through the internal cavities of the nut sleeve 8 and the ball nut 3 in turn, thereby realizing the adaptable connection of the dummy shaft 1, the nut sleeve 8 and the ball nut 3, and a circular groove of the size of the steel ball required by the ball nut 3 is provided at one end of the ball taking plate 7, and the grooves are arranged in a matrix, which is convenient for observing the number of steel balls. The above structure can perform steel ball assembly work for ball nuts 3 of different models.

[0025] Please see attached Figure 3 , 4 In order to accurately adjust the positional relationship between the ball nut 3 and the dummy shaft 1, in the present embodiment, an internal thread structure is provided on the inner wall of the cavity of the rotating nut seat 2, and the internal thread structure of the rotating nut seat 2 is adapted to be connected with the external thread structure of the trapezoidal screw rod 4. When the rotating nut seat 2 is rotated, the rotating nut seat 2 realizes linear motion on the trapezoidal screw rod 4, and the end of the rotating nut seat 2 away from the circular bottom plate 5 abuts against the nut sleeve 8. The linear motion of the rotating nut seat 2 drives the motion of the nut sleeve 8, thereby being able to accurately control the positional relationship between the ball nut 3 and the dummy shaft 1.

[0026] When in use, use the ball taking plate 7 to take out the corresponding number of steel balls. According to the different steel ball circulation methods of the ball nut 3, the number of steel balls required by the corresponding method is taken. The axial reverse structure takes the number of steel balls required for the entire ball nut 3 at one time, and the internal circulation reverse structure takes the number of steel balls for one circle. After one circle is installed, the steel balls for the next circle are taken out. The number of circular grooves on the ball taking plate 7 is consistent with the number of balls taken at one time to ensure the consistency of the number of assembled steel balls. Then, the steel balls are poured into the ball nut 3 where the steel balls need to be installed through the funnel 6. This is because the inner diameter of the ball nut is small to prevent the steel balls from spilling during the installation process. Then, use tweezers to poke the steel balls into the corresponding steel ball grooves. During this process, the ball nut 3 is lowered from top to bottom by rotating the rotating nut seat 2, so that all the steel balls enter the steel ball grooves. Finally, use a conventional corresponding model of false shaft 1 to take out the ball nut 3 and install it on the screw required for the ball nut.

[0027] The advantages of the utility model are that the device has a simple structure and is easy to operate, the operator can accurately control the relative position of the ball nut and the dummy shaft, and novice operators can quickly get started, thereby improving assembly efficiency and ensuring the consistency of the number of assembled steel balls.

[0028] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A ball screw nut pair steel ball assembly fixture, characterized in that: It includes a dummy shaft and a trapezoidal screw, one end of the dummy shaft is used for movably assembling with the inner wall of the ball nut, and the other end is fixedly connected to the trapezoidal screw; it also includes a rotating nut seat, the rotating nut seat is movably sleeved on the trapezoidal screw so that the rotating nut seat can reciprocate on the trapezoidal screw, and one end of the rotating nut seat is provided with an abutment portion abutting with the ball nut.

2. The ball screw nut pair steel ball assembly fixture according to claim 1, characterized in that: The connecting surface between the dummy shaft and the ball nut is a smooth surface.

3. The ball screw nut pair steel ball assembly fixture according to claim 2, characterized in that: The other end of the dummy shaft is provided with an external thread structure, the inner wall of the trapezoidal screw cavity is provided with an internal thread structure, and the external thread structure and the internal thread structure are adaptively connected.

4. The ball screw nut pair steel ball assembly jig according to claim 1, characterized in that: It also includes a nut sleeve movably sleeved on one end of the smooth surface of the false shaft, one side of the nut sleeve is provided with a groove for accommodating the ball nut, and the other side abuts against the abutting portion.

5. The ball screw nut pair steel ball assembly jig according to claim 1, characterized in that: It also includes a ball taking plate for taking steel balls, one end of which is provided with circular grooves arranged in a matrix.

6. The ball screw nut pair steel ball assembly jig according to claim 5, characterized in that: It also includes a funnel, which cooperates with the ball taking plate to carry the steel ball into the inner cavity of the ball nut.

7. The ball screw nut pair steel ball assembly jig according to claim 1, characterized in that: The outer surface of the rotating nut seat is provided with a rough contact surface with staggered stripes.

8. The ball screw nut pair steel ball assembly jig according to claim 1, characterized in that: It also includes a bottom plate for being placed on a plane, and the bottom plate is connected to one end of the trapezoidal lead screw away from the dummy shaft.

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