In the assembly and production process of sand cores, automated assembly lines are often used to improve assembly efficiency.The transmission mechanism of the existing assembly line body includes a motor, a plurality of double-row sprockets in series, and a transmission shaft. Each double-row sprocket is connected to a transmission shaft. The motor drives the series-connected double-row sprocket to rotate, thereby driving the transmission shaft to rotate. .Due to the relatively large meshing gap between the chain and the gear of the sprocket, the existing transmission mechanism will emit a lot of noise during transmission; when the existing transmission mechanism requires reverse transmission due to working conditions, the motor is driven by reverse rotation The double-row sprocket reverses to achieve reverse transmission. However, due to the sudden direction switching, the chain of the sprocket instantly changes from the state of upper tightening and lowering to the state of upper loosening and lowering tightening, which will cause chain damage and the material will be sent out. Loud noise.In addition, because the transmission shaft of the existing transmission mechanism is usually not equipped with a transition roller, the sand core tray is directly placed on the transmission shaft for transmission. When the sand core tray is stopped by resistance or the mechanism, if the transmission shaft is still Rotation, the friction between the drive shaft and the sand core tray increases, thereby increasing the wear on the sand core tray.

   Contents of the utility model In order to solve the above technical problems, the purpose of the utility model is to provide a bevel gear transmission mechanism, which not only has low noise, but also reduces the wear on the sand core tray.

   In order to achieve the above purpose, the technical scheme of the present invention is as follows:

   A bevel gear transmission mechanism includes an aluminum profile support, a motor fixed on the outside of the aluminum profile support, and a sprocket connected to the motor. The bevel gear transmission mechanism also includes a drive shaft and a bevel gear drive wheel , Umbrella-tooth driven wheels, transmission shafts, rollers, the drive shaft is arranged along the length of the aluminum profile and connected with the sprocket, and a plurality of the umbrella-tooth driving wheels are sleeved on the drive shaft, A plurality of transmission shafts are longitudinally connected to the inner side of the aluminum profile bracket, at least a pair of the rollers are sleeved on the transmission shaft, and one end of the transmission shaft is sleeved with the umbrella tooth driven wheel, so The bevel-tooth driven wheel and the bevel-tooth driving wheel are in one-to-one correspondence.

   Preferably, a friction sleeve is provided between the transmission shaft and the roller.

   Preferably, one end of the aluminum profile bracket is fixedly provided with a blocking member, the blocking member includes a cylinder, a connector fixed on the telescopic rod of the cylinder, and inserted in a groove on the head of the connector Blocking block.

   Preferably, one end of the aluminum profile bracket is also fixedly provided with a positioning cylinder, a positioning column is connected to the positioning cylinder, and the head of the positioning column is tapered.

   Preferably, a pair of rollers are sleeved on the transmission shaft.

   Through the above technical solution, when the bevel gear transmission mechanism provided by the present invention is working, because the meshing gap between the bevel gear main and driven wheels is small and the fit is tight, the noise pollution of the transmission mechanism is reduced when the transmission mechanism is working; When the pallet is blocked by the blocking mechanism and is stationary, the roller also stops rotating and is in a static state, and the drive shaft only rubs against the friction sleeve. In this way, the friction between the roller and the sand core tray is greatly reduced, and the wear on the sand core tray is reduced. .