What is the method for making the sliding mechanism of the suction nozzle rod?

What is the method for making the sliding mechanism of the suction nozzle rod?

1. Suction nozzle rod background technology:

The placement machine is the main equipment in the SMT production line, and the placement head is the core component of the placement machine. The existing placement head includes a substrate, a nozzle rod assembly, a Z-axis downward pressure mechanism that drives the nozzle rod assembly to move vertically, and a R-axis rotation mechanism that drives the nozzle rod assembly to move horizontally in a circular motion.

The Z-axis downward pressure mechanism consists of a Z-axis downward pressure motor and a downward pressure rod (or downward pressure block), with the downward pressure rod usually located above the suction nozzle rod assembly. The Z-axis downward pressure motor drives the suction nozzle rod assembly to move vertically up and down through the downward pressure rod.

The nozzle rod assembly includes a spline nozzle rod, a nozzle assembly, a spline bearing connected to the spline nozzle rod, a reset spring and a limit nut. The bottom end of the spline suction nozzle rod is connected to the suction nozzle assembly. The spline section of the spline suction nozzle rod is embedded with a spline bearing. The smooth shaft section of the spline suction nozzle rod is embedded with a reset spring. The top end of the spline suction nozzle rod is threorally connected to the limit nut, and the reset spring is located between the limit nut and the spline bearing. A spline suction nozzle rod refers to a suction nozzle rod with spline grooves set on a section of its outer circular wall, hence the name spline suction nozzle rod. After the spline suction nozzle rod and the spline bearing are assembled, the spline bearing can move up and down along the axial direction of the spline suction nozzle rod, and it can also move in a circular motion along the radial direction of the spline suction nozzle rod. From this, it can be seen that the fit between the spline suction nozzle rod and the spline bearing also plays a guiding role during the up and down movement process.

When the placement head is in operation, the spline suction nozzle rod naturally needs to move up and down repeatedly. There will inevitably be friction between the spline suction nozzle rod and the spline bearing. With friction, wear and tear will naturally occur. At present, the domestic spline suction nozzle rods have the following problems: After processing the structure of the spline suction nozzle rod, if the material hardness is improved, the spline suction nozzle rod will deform, seriously affecting the accuracy of the suction nozzle rod assembly. If the material hardness of the spline suction nozzle rod is improved first, the improved spline suction nozzle rod will be too hard to be processed again. Therefore, if one wants to enhance the wear resistance of the spline suction nozzle rod and extend its service life, currently, the spline suction nozzle rod can only rely on imports, which are very expensive.

In conclusion, how to improve or replace the guiding structure of the existing suction nozzle rod during the up and down movement, how to reduce the wear resistance and precision requirements of the spline suction nozzle rod and spline bearings while achieving working accuracy and service life, thereby reducing the production difficulty of the suction nozzle rod and further lowering the production cost of the mounting head, has become one of the urgent problems to be solved in the industry.

Suction nozzle rod

2. Technical implementation elements of the suction nozzle rod:

The purpose of the case in this paper is to provide a sliding mechanism for the suction nozzle rod in view of the defects and deficiencies of the existing technology.

To achieve the above goals, the technical solution adopted in the case of this article is:

The sliding mechanism of the suction nozzle rod described in the case of this article comprises a suction nozzle rod, a sliding fixed frame and a sliding mechanism body. The outer circular wall of the suction nozzle rod is connected to the suction nozzle rod sleeve through a rod sleeve bearing. One end of the sliding fixed frame is fixedly set on the surface of the mounting head fixed base plate, and the other end of the sliding fixed frame is connected to the suction nozzle rod sleeve through the sliding mechanism body. Both the nozzle rod sleeve and the nozzle rod can slide along the length direction of the nozzle rod on the sliding mechanism body.

Further, the sliding mechanism body comprises a suction nozzle rod sleeve guide rail and a suction nozzle rod sleeve slider. One end of the suction nozzle rod sleeve guide rail is fixedly arranged at the other end of the sliding fixed frame, and the other end of the suction nozzle rod sleeve guide rail is engaged with one end of the suction nozzle rod sleeve slider, and the other end of the suction nozzle rod sleeve slider is fixedly connected with the suction nozzle rod sleeve. The slider of the nozzle rod sleeve slides along the length direction of the nozzle rod on the nozzle rod sleeve guide rail.

After adopting the above structure, the beneficial effects of the case in this paper are as follows: The sliding mechanism of the suction nozzle rod described in the case in this paper comprises a suction nozzle rod, a sliding fixed frame and a sliding mechanism body. The outer circular wall of the suction nozzle rod is connected to the suction nozzle rod sleeve through the rod sleeve bearing. One end of the sliding fixed frame is fixedly set on the surface of the mounting head fixed base plate, and the other end of the sliding fixed frame is connected to the suction nozzle rod sleeve through the sliding mechanism body. Both the nozzle rod sleeve and the nozzle rod can slide along the length direction of the nozzle rod on the sliding mechanism body. When using the case in this article, the other end of the sliding fixed frame is connected to the nozzle rod sleeve through the sliding mechanism body, and the sliding mechanism body can guide the nozzle rod to move up and down along its axial direction. It greatly reduces the friction between the suction nozzle rod and the spline bearing, replaces the guiding function when the suction nozzle rod and the spline bearing are used in combination, thereby lowering the wear resistance and precision requirements of the spline suction nozzle rod and the spline bearing, and thus eliminates the phenomenon of relying on imported spline suction nozzle rods, greatly reducing the production cost of the mounting head.