Ball screw filling device and method

Abstract

The present invention discloses a ball-filling device and method for a ball screw, comprising a replacement rod, a nut positioning sleeve, and a replacement rod positioning sleeve. The nut positioning sleeve is coaxially located in the replacement rod positioning sleeve and is screwed with the replacement rod positioning sleeve through a thread. The nut positioning sleeve is used to install and position the nut of the ball screw, so that the nut moves with the nut positioning sleeve. The replacement rod is coaxially located in the nut positioning sleeve. The lower end of the replacement rod passes through the nut positioning sleeve and is fixed to the replacement rod positioning sleeve. The upper end of the replacement rod is provided with a connecting portion for connecting the screw rod, which is used to realize the assembly of the nut and the screw rod after the ball filling is completed. The device and method make the assembly of the ball screw simple, improve the assembly efficiency of the ball screw, and avoid the cumbersome cleaning of the ball screw; the replacement rod and the screw rod are used for positioning, which ensures that the screw rod is installed quickly and accurately after the nut is filled with balls, and improves the assembly quality of the ball screw; in addition, the ball-filling device has a simple structure and saves costs.

Description

Technical Field

[0001] The invention relates to the field of ball screw assembly, and in particular to a ball filling device and method for a ball screw. Background Art

[0002] In mechanical equipment, ball screws are commonly used components for transmission. At present, when assembling ball screws, the steel balls to be filled into the thread raceways of the nut are usually coated with grease first, and then placed into the thread raceways of the nut one by one and made to stick to the thread raceways. Then the screw is screwed into the nut to complete the installation of the ball screw. However, this installation method is inefficient, and the grease used during installation cannot be used when the ball screw is working. Therefore, the ball screw needs to be cleaned to ensure the normal use of the ball screw. However, this grease is difficult to clean, which makes the subsequent cleaning process cumbersome and the cleanliness of the parts cannot be guaranteed. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a ball filling device and method for a ball screw, which improves the installation efficiency of the ball screw and also avoids the problem of cleaning the ball screw during the installation process.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a ball filling device for a ball screw, comprising a replacement rod, a nut positioning sleeve, and a replacement rod positioning sleeve, the nut positioning sleeve being coaxially located in the replacement rod positioning sleeve and being screwed to the replacement rod positioning sleeve through a thread, the nut positioning sleeve being used to install and position the nut of the ball screw so that the nut moves with the nut positioning sleeve, the replacement rod being coaxially located in the nut positioning sleeve, the lower end of the replacement rod passing through the nut positioning sleeve and being fixed to the replacement rod positioning sleeve, the upper end of the replacement rod being provided with a connecting portion for connecting the screw rod, which is used to realize the assembly of the nut and the screw rod after the ball filling is completed.

[0005] Preferably, when the nut is coaxially sleeved on the replacement rod, the gap between the thread raceway of the nut and the replacement rod is equal to or slightly larger than the diameter of the steel ball.

[0006] Preferably, the replacement rod and the nut positioning sleeve are both made of non-metallic materials.

[0007] Preferably, the replacement rod is a bare rod.

[0008] Preferably, the thread between the nut positioning sleeve and the replacement rod positioning sleeve is a fine pitch thread to ensure the accuracy of the upper and lower ball filling positions of the nut.

[0009] Preferably, a positioning boss is integrally provided inside the nut positioning sleeve, a clamping block is integrally provided on the positioning boss, a positioning piece is provided on the fixing sleeve of the nut, a clamping slot is provided on the positioning piece, when the nut is installed in the nut positioning sleeve, the positioning piece abuts against the positioning boss, the clamping slot cooperates with the clamping block, so that the nut moves together with the nut positioning sleeve.

[0010] A method for filling balls using the ball filling device comprises the following specific steps:

[0011] S1. Place the nut coaxially into the nut positioning sleeve and position the two together;

[0012] S2, fill a group of steel balls into the gap between the replacement rod and the thread raceway of the nut, and move the steel balls to arrange them in sequence along the thread raceway;

[0013] S3, rotating the nut positioning sleeve to make the nut positioning sleeve move upward relative to the replacement rod positioning sleeve, and at the same time driving the nut to rotate and move upward, so that the steel ball filled in the thread raceway moves downward of the thread raceway;

[0014] S4, repeat steps S2 to S3 to sequentially fill the other groups of steel balls into the thread raceway of the nut;

[0015] S5. After the balls are filled, one end of the screw rod is matched with the connecting portion of the upper end of the replacement rod, and the screw rod and the replacement rod are made coaxial;

[0016] S6, rotating the nut positioning sleeve until the nut and the screw rod are assembled to obtain the ball screw;

[0017] S7. After assembly is completed, remove the ball screw.

[0018] Compared with the prior art, the advantages of the present invention are: the device and method simplify the assembly of the ball screw, while improving the assembly efficiency of the ball screw and avoiding the cumbersome cleaning of the ball screw; since the thread between the nut positioning sleeve and the replacement rod positioning sleeve is set as a fine thread, the accuracy of the upper and lower ball filling positions of the nut and the stability of the quality of the assembly process are guaranteed; and since the ball screw assembly adopts the replacement rod and the screw to coordinate positioning, the screw can be installed quickly and accurately after the nut is filled with the ball, the assembly quality of the ball screw is improved, and it is also convenient for the replacement of the screw during installation; in addition, the ball filling device has a simple structure and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the ball filling device of the present invention;

[0020] Figure 2 It is a schematic diagram of the assembly of the screw rod of the present invention;

[0021] Figure 3 A top view of the ball filling device of the present invention;

[0022] Figure 4 It is a flow chart of the ball filling method of the present invention.

[0023] 1-replacement rod, 2-nut, 3-nut positioning sleeve, 31-positioning boss, 4-replacement rod positioning sleeve, 5-screw rod, 6-connecting part, 7-steel ball, 8-positioning piece, 9-block. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] As shown in Figures 1 to 3, a ball filling device for a ball screw includes a replacement rod 1, a nut positioning sleeve 3, and a replacement rod positioning sleeve 4. The nut positioning sleeve 3 is coaxially located in the replacement rod positioning sleeve 4 and is screwed with the replacement rod positioning sleeve 4 through a thread. The thread between the nut positioning sleeve 3 and the replacement rod positioning sleeve 4 is a fine thread to ensure the accuracy of the upper and lower ball filling positions of the nut 2. The nut positioning sleeve 3 is used to install and position the nut 2 of the ball screw. The interior of the nut positioning sleeve 3 is integrally provided with a positioning boss 31, and a clamping block 9 is integrally provided on the positioning boss 31. The fixed sleeve on the nut 2 is provided with a positioning piece 8, and a clamping port (not marked in the figure) is provided on the positioning piece 8. When the nut 2 is installed in the nut positioning sleeve 3, the positioning piece 8 is against the positioning boss 31, and the clamping port cooperates with the clamping block 9, so that the nut 2 moves with the nut positioning sleeve 3. The replacement rod 1 is coaxially located in the nut positioning sleeve 3. The replacement rod 1 and the nut positioning sleeve 3 are both made of non-metallic materials, such as PP and plastic, and the replacement rod 1 is a bare rod. The lower end of the replacement rod 1 passes through the nut positioning sleeve 3 and is screwed and fixed to the replacement rod positioning sleeve 4. When the nut 2 is coaxially sleeved on the replacement rod 1, the gap between the threaded raceway of the nut 2 and the replacement rod 1 is equal to or slightly larger than the diameter of the steel ball 7. The upper end of the replacement rod 1 is provided with a connecting part 6 for connecting the screw rod 5. The connecting part 6 and the screw rod 5 can be connected by threads or by other detachable methods, so as to realize the assembly of the nut 2 and the screw rod 5 after the ball filling is completed.

[0026] The method for filling balls using the ball filling device of the present invention comprises the following steps:

[0027] S1, coaxially place the nut 2 into the nut positioning sleeve 3, and position the two relative to each other;

[0028] S2, fill a group of 15 steel balls 7 into the gap between the replacement rod 1 and the thread raceway of the nut 2, and move the steel balls 7 to arrange them in sequence along the thread raceway;

[0029] S3, rotating the nut positioning sleeve 3 to move the nut positioning sleeve 3 upward relative to the replacement rod positioning sleeve 4, while driving the nut 2 to rotate and move upward together, so that the steel ball 7 filled in the thread raceway moves downward of the thread raceway;

[0030] S4, repeat steps S2 to S3 to sequentially fill the other groups of steel balls 7 into the thread raceway of the nut 2;

[0031] S5, after the ball filling is completed, one end of the screw rod 5 is matched with the connecting portion of the upper end of the replacement rod 1, and the screw rod 5 and the replacement rod 1 are made coaxial;

[0032] S6, rotating the nut positioning sleeve 3 until the nut 2 and the screw rod 5 are assembled to obtain a ball screw;

[0033] S7. After assembly is completed, remove the ball screw.

[0034] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A ball filling device for a ball screw, characterized in that The present invention comprises a replacement rod, a nut positioning sleeve, and a replacement rod positioning sleeve, wherein the nut positioning sleeve is coaxially located in the replacement rod positioning sleeve and is screwed with the replacement rod positioning sleeve through a thread, the nut positioning sleeve is used to install and position the nut of the ball screw, so that the nut moves with the nut positioning sleeve, the replacement rod is coaxially located in the nut positioning sleeve, the lower end of the replacement rod passes through the nut positioning sleeve and is fixed to the replacement rod positioning sleeve, the upper end of the replacement rod is provided with a connecting portion for connecting the screw rod, which is used to realize the assembly of the nut and the screw rod after the ball filling is completed, the nut positioning sleeve and the The thread between the replacement rod positioning sleeve is a fine thread to ensure the accuracy of the upper and lower ball filling positions of the nut. When the nut is coaxially sleeved on the replacement rod, the gap between the thread raceway of the nut and the replacement rod is equal to or slightly larger than the diameter of the steel ball. A positioning boss is integrally provided inside the nut positioning sleeve, and a clamping block is integrally provided on the positioning boss. A positioning piece is provided on the fixed sleeve of the nut, and a bayonet is provided on the positioning piece. When the nut is installed in the nut positioning sleeve, the positioning piece abuts against the positioning boss, and the bayonet cooperates with the clamping block, so that the nut moves with the nut positioning sleeve.

2. A ball-filling device for a ball screw as claimed in claim 1, characterized in that The replacement rod and the nut positioning sleeve are both made of non-metallic materials.

3. A ball-filling device for a ball screw as claimed in claim 1, characterized in that The replacement rod is a bare rod.

4. A method for filling balls using the ball filling device according to claim 1, characterized in that The specific steps include: S1. Place the nut coaxially into the nut positioning sleeve and position the two together; S2, fill a group of steel balls into the gap between the replacement rod and the thread raceway of the nut, and move the steel balls to arrange them in sequence along the thread raceway; S3, rotating the nut positioning sleeve to make the nut positioning sleeve move upward relative to the replacement rod positioning sleeve, and at the same time driving the nut to rotate and move upward, so that the steel ball filled in the thread raceway moves downward of the thread raceway; S4, repeat steps S2 to S3 to sequentially fill the other groups of steel balls into the thread raceway of the nut; S5. After the balls are filled, one end of the screw rod is matched with the connecting portion of the upper end of the replacement rod, and the screw rod and the replacement rod are made coaxial; S6, rotating the nut positioning sleeve until the nut and the screw rod are assembled to obtain the ball screw; S7. After assembly is completed, remove the ball screw.

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