Special chain drive pumping unit

Abstract

The invention relates to a special chain drive pumping unit, comprising a frame, a balance box, and encircling chains of a driven chain wheel and a drive chain wheel; one end of the connecting rod is connected with special chain links of chain suspension loads, the other end of the connecting rod is articulated with a hanging seat of traction rope and the balance box, one end of the traction rope is wrapped with the eccentric wheel articulated on the hanging seat of the traction rope, the other end of the traction rope goes around a crownpulley and is connected with a polish rod at the mouth of a well by a rope hanger, and a motor shaft is connected with a first transmission. The pumping unit is characterized in that two connecting rods are respectively positioned on both sides of the balance box; a second transmission is arranged and connected with the first transmission; the chain is a special chain formed by sequentially articulating a plurality of chain links and a plurality of special chain links; the special chain links of suspension loads are placed in the middle; both the drive chain wheel and the driven chain wheel consist of chain wheels and a plurality of chain teeth attached by wear layers, and the chain teeth are fixed on the chain wheels. The invention has the advantages that the structure is reasonable, the motion is smooth, the impact of reversion of chain links suspension loads can be prevented, energy can be saved and cost can be lowered and the like.

Description

technical field [0001] The invention relates to petroleum machinery, which is a special chain pumping unit. Background technique [0002] The existing chain pumping unit includes a frame, in which a balance box is built-in, and the chain is wrapped around the driven sprocket and the driving sprocket arranged above and below the frame, and the special chain link of the chain is connected to the connecting rod, and the connecting rod Hinged on the balance box, one end of the traction rope is connected to the balance box, and the other end of the traction rope goes around the sky wheel and connects with the polished rod at the wellhead through the rope hanger. The drive sprocket is driven by the reduction box driven by the frequency conversion motor as the power. This chain pumping unit has the advantage of long stroke, so it is the preferred equipment for extracting oil. But the existing chain pumping unit has the following disadvantages: because the inner and outer chain pla...

AI Technical Summary

Problems solved by technology

But the existing chain pumping unit has the following disadvantages: because the inner and outer chain plates of the chain link are in the shape of "8", and the inner and outer chain plates are not restrained, when the special chain link of the suspended load passes through the driving sprocket to change When moving in the opposite direction, the driving sprocket makes the chain pull through the chain link behind the driving sprocket, while the front chain link is in a relaxed state due to the thrust. The driving sprocket is continuously rotating, but the special chain must wait for the chain link that has moved in the reverse direction The chain link can continue to move only after it is tightened, resulting in a reversing impact on the load suspended by the special chain link of the chain. Within a certain range, the greater the degree of slack in the transmission chain, the greater the degree of reversing impact generated by the chain pumping unit , the continuous reversing impact leads to accelerated wear between the chain and sprocket, which undoubtedly greatly reduces the service life of the chain pumping unit, increases the maintenance time, and affects the efficiency of pumping operations , which increases the production cost; also because the sprocket is a sprocket with an integral structure, the sprocket surface of the sprocket has poor wear resistance, and the sprockets of the sprocket cannot be replaced individually, and the damage of a certain sprocket leads to the scrapping of the sprocket with the overall structure ; and because the existing chain pumping unit is a single connecting rod, the upper and lower reciprocating movements of the balance box are unbalanced in force, so that the upper and lower reciprocating movements of the balance box are not stable, the single connecting rod is easily damaged, and the balance box is increased. The wear of the guide wheel and the guide rail of the frame affects the service life; and because the motor adopts a frequency conversion motor, not only the power is large, but also when the pumping unit is installed or maintained, the power of the motor itself cannot lift the balance box alone, and additional lifting equipment is required The installation or maintenance of the pumping unit can only be carried out after lifting the balance box, which is labor-intensive and time-consuming, and increases the cost

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