A kind of pulp pump with large amount of injection and small amount of injection

Abstract

The invention discloses a slurry pump that injects both a large amount and a small amount, including a large reciprocating volume pump. The large reciprocating volume pump includes a large reciprocating part, a large pump body and a large pump inlet and outlet. In the large pump body, A small reciprocating piece fixed with the large reciprocating piece is arranged, a small pump body is arranged in the base of the large pump body, and a small pump inlet and outlet are arranged in the small pump body. The reciprocating positive displacement pump provided by the invention can realize both a large amount of injection and a small amount of color paste by using a large-section pump, which ensures the accuracy of the injection amount of color paste, especially the injection accuracy of a small amount of color paste. Compared with the prior art, the utility model has the advantages of high precision, simple structure, good leak-proof performance, high utilization rate in the length direction of the reciprocating pump cylinder, small elastic deformation of the pump bracket, which improves the stroke accuracy of the reciprocating pump, and solves the problem of gas collection in the pump. Seriously affect the micro-injection slurry accuracy. Likewise, the toning machine made of the pump is easy to use and occupies a small area.

Description

technical field [0001] The invention relates to the field of reciprocating pumps, in particular to a reciprocating pump capable of injecting colored slurry in large quantities and in small quantities. Background technique [0002] In the field of color matching technology, using a reciprocating pump to inject quantitative color paste is a key technology. At present, the common reciprocating positive displacement pumps include piston pumps, plunger pumps, and folding pumps. Toning has strict requirements on the amount of color paste. It is required that the error of the amount of color paste injected by the pump should not exceed a certain percentage (such as less than 1%) when injecting a large amount of color paste (such as greater than 15 ml). When there is a small amount of color paste (such as less than 0.5 ml), the error of the color paste injection volume cannot exceed a certain percentage (such as less than 12%). However, the current common reciprocating pumps for in...

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Problems solved by technology

[0003] In addition to the shortcomings mentioned above in the prior art and the key points to solve the problem, the US2009236367A1 patented product also has the following defects: (1) When the pump is not used for a long time, and the color paste is thick and may not be pressed down, it is necessary to increase the force Press down, because the spring has a certain elastic limit, the piston and the wall have a certain friction, the spring is easy to be deformed when injecting a large amount of color paste, causing the error of the pump injection stroke; (2) The sliding device is either in the middle or on both sides Both need to be particularly well sealed to prevent the color paste from leaking out

(3) The spring pre-tightening force must be set. When the spring pre-tightening force is set too high, the power of the motor will be too large, which will waste energy. It is easy to cause deformation, displacement and vibration of the frame, which will lead to changes in the stroke of the pump rod and affect the accuracy of the pulp output; (4) When the spring pre-tightening force is set small and the resistance of the color paste is large, it is easy to cause spring compression and affect the output. The accuracy of slurry volume; (5) The gas in the pump will seriously affect the accuracy of small metered color paste injection

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