Support frame

1. A support frame, comprising: a column, a rocker arm, a tray, an adjustment shaft and a fixing block, wherein the column is vertically arranged, the rocker arm is horizontally arranged, and the column and the rocker arm are connected by a hinge; the rocker arm comprises a transverse support tube, the transverse support tube is connected to the hinge, and the transverse support tube is a hollow round tube; the adjustment shaft is arranged inside the transverse support tube, an elastic member is provided at one end of the adjustment shaft, and one end of the elastic member is connected to the adjustment shaft and another end of the elastic member is connected to the column or the hinge; the transverse support tube is provided with a plurality of U-shaped grooves, the fixing block is arranged outside the transverse support tube, and the tray is connected to the fixing block, and

the fixing block passes through the U-shaped groove to be connected to the adjustment shaft, or, the support frame further comprises a screw, and the screw is configured to pass through the U-shaped groove, to connect the fixing block to the adjustment shaft.

2. The support frame according to claim 1 , wherein the elastic member is a spring, the U-shaped groove is arranged in an axial direction of the adjustment shaft, and an opening of the U-shaped groove faces away from the hinge.

3. The support frame according to claim 1 , wherein the elastic member is a tension spring, the U-shaped groove is arranged in an axial direction of the adjustment shaft, and an opening of the U-shaped groove faces towards the hinge.

4. The support frame according to claim 1 , wherein the hinge comprises a fixed plate, a movable plate, a rotating shaft, a spring, and an adjusting screw; the fixed plate is arranged on the column, and the fixed plate and the movable plate are connected through the rotating shaft; the rocker arm is connected to the movable plate, and one end of the rotating shaft is provided with an engagement cap, and another end of the rotating shaft is provided with a threaded hole corresponding to the adjusting screw; the rotating shaft passes through the movable plate and the fixed plate to be connected to the adjusting screw, and the engagement cap fits closely to the movable plate; the spring is arranged between a screw cap of the adjusting screw and the fixed plate, a shape of a cross section of a portion, located in the fixed plate and/or the movable plate, of the rotating shaft is non-circular, and a shape of through holes in the fixed plate and the movable plate match the non-circular shape.

5. The support frame according to claim 4 , wherein the shape of the cross section of the portion, located in the fixed plate and/or the movable plate, of the rotating shaft is any one of a rectangular shape, a triangular shape, an arcuate shape, a pentagonal shape, and a hexagonal shape.

6. The support frame according to claim 1 , wherein the rocker arm further comprises an inclined support tube, the inclined support tube has one end connected to the transverse support tube and another end connected to the column through the hinge, and the inclined support tube, the transverse support tube and the column form a triangle.

7. The support frame according to claim 1 , wherein the adjustment shaft is made from a nylon material.

8. The support frame according to claim 1 , wherein the rocker arm further comprises an end cover arranged at an end, away from the hinge, of the transverse support tube.