Auxiliary mounting device for linear rails

An auxiliary mounting device for linear rails, comprising:

• a connecting rail with each side having a first auxiliary groove;
• and
• a ball-filling rail formed on one end of the connecting rail, the ball-filling rail having two swinging arms and a flap, the two swinging arms extending from one end of the connecting rail, the two swinging arms each having a second auxiliary groove and a pivoting portion, the two second auxiliary grooves corresponding to the two first auxiliary grooves respectively, the two pivoting portions connecting the two swinging arms and one end of the connecting rail, the flap being provided between the distal ends of the two swinging arms, both sides of the flap being connected to the insides of the two swinging arms, the flap having two lateral edges and an inward-folding crease, the two lateral edges connecting both sides of the flap and the distal ends of the two swinging arms, the inward-folding crease being formed in the middle of the flap,
• whereby the ball-filling rail allows balls to be mounted between the sliding block and the rail, and the connecting rail keeps the sliding block mounted on the rail, thus preventing balls from falling out.