A multi-stage wood chip washer

Abstract

This invention provides a multi-stage wood chip washing machine, comprising at least two stages of chambers connected in series along the wood chip conveying direction. The overflow port of the preceding chamber is connected to the inlet of the following chamber. Each chamber contains a horizontally rotatable rotor, with several pressure plates fixed to its outer circumference. As the rotor rotates, the pressure plates press the wood chips into the water and agitate them, promoting impurity separation. Each chamber has a conical sedimentation hopper at its bottom, with a discharge pipe connected to its lower end. A discharge valve and a flushing valve are connected in series on the discharge pipe. The rotor speed increases sequentially within the chambers along the wood chip conveying direction, and the pressure plates are arranged at an angle, with auxiliary supports vertically positioned on the sides of the pressure plates. An exhaust port is located at the top of each chamber, and inspection ports are provided on both the top and sides. This invention, employing a multi-stage series connection, extends the residence time of the wood chips in the water, significantly improving the washing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment technology, specifically to a multi-stage wood chip washing machine. Background Technology

[0002] In China's paper industry, wood still accounts for a large proportion of pulping raw materials. During the wood processing, the cut wood chips contain impurities such as stones, wire, and dust. If not effectively cleaned, these impurities will exacerbate wear on subsequent pulping equipment (such as refiners and digesters), increasing equipment maintenance costs and unplanned downtime, and potentially affecting pulp quality. Traditional wood chip washing machines utilize the fact that wood chips are less dense than water, causing them to float on the surface of the washing water. A rotor with a pressure plate pushes the washing water containing wood chips towards the discharge port, while impurities settle to the bottom of the casing and are discharged through an intermittently opening gate valve. However, existing single-stage washing devices have the following drawbacks: short washing path, low single-pass cleaning rate, requiring repeated circulation, and high water consumption; the discharge port is prone to clogging, and rinsing and discharge cannot be linked, making operation cumbersome.

[0003] Therefore, there is an urgent need for a wood chip washing equipment that is simple in structure, continuously efficient, and has smooth slag discharge. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a multi-stage wood chip washing machine that employs multi-stage series connection, making it less prone to clogging and achieving a high washing efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A multi-stage wood chip washing machine includes: at least two stages of chambers, which are connected in series along the wood chip conveying direction, with the overflow port of the previous chamber connected to the feed port of the next chamber; Each chamber has a horizontally rotatable rotor, with several pressure plates fixed around its outer perimeter. As the rotor rotates, the pressure plates press the wood chips into the water and agitate them, promoting the separation of impurities. Each chamber has a conical sludge hopper at its bottom, with a sludge discharge pipe connected to its lower end. A sludge discharge valve and a flushing valve are connected in series on the sludge discharge pipe. The rotors in the chambers connected in series along the wood chip conveying direction have increasing rotational speeds, and the pressure plates are arranged at an angle, with auxiliary supports vertically arranged on the sides of the pressure plates.

[0006] Furthermore, the sludge hopper has an inverted conical structure with a cone angle of 50–70°.

[0007] The top of the chamber is equipped with an exhaust port, and inspection ports are provided on the top and sides of the chamber.

[0008] Compared with the existing technology, the beneficial effects of this utility model are: the multi-stage series connection extends the residence time of wood chips in water, and the washing rate is significantly improved; each stage discharges slag independently, and continuous production can be achieved without stopping the machine; the "rinsing + slag discharge" dual valve linkage ensures smooth slag discharge, prevents blockage, and saves more than 20% of water; the rotor pressure plate has the functions of stirring, pressing and dispersing, adapts to different specifications of wood chips, and the equipment operates stably with low maintenance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention when two stages are connected in series; Figure 2 This is a schematic diagram of the structure of the present invention when three stages are connected in series; Figure 3 This is a schematic diagram of the structure of the present invention when four levels are connected in series; Figure 4 yes Figure 1 Side view; Figure 5 yes Figure 3 Top view; Figure 6 This is a schematic diagram of the rotor described in this utility model. Detailed Implementation

[0010] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

[0011] See Figure 1-6 A multi-stage wood chip washing machine includes: at least two stages of chambers 10, which are connected in series along the wood chip conveying direction, with the overflow port of the first chamber connected to the feed port of the second chamber, and a feed port 11 provided at the top of the chamber.

[0012] Each chamber has a horizontally rotatable rotor 20, with several pressure plates 21 fixed around its outer perimeter. As the rotor rotates, the pressure plates press the wood chips into the water and agitate them, promoting impurity separation. Each chamber has a conical sludge hopper 30 at its bottom, with a sludge discharge pipe connected to its lower end. A sludge discharge valve 31 and a flushing valve 32 are connected in series on the sludge discharge pipe. The rotors in the chambers, connected sequentially along the wood chip conveying direction, have increasing rotational speeds, and the pressure plates 21 are arranged at an angle. Auxiliary supports 22 are vertically positioned on the sides of the pressure plates.

[0013] The sludge hopper has an inverted conical structure with a cone angle of 50–70°.

[0014] The top of the silo is equipped with an exhaust port 40, and inspection ports 50 are provided on the top and sides of the silo.

Claims

1. A multi-stage wood chip washing machine, characterized in that, include: At least two-stage bins are connected in series along the wood chip conveying direction, with the overflow port of the previous bin connected to the feed port of the next bin. Each chamber has a horizontally rotatable rotor, with several pressure plates fixed around its outer perimeter. As the rotor rotates, the pressure plates press the wood chips into the water and agitate them, promoting the separation of impurities. Each chamber has a conical sludge hopper at its bottom, with a sludge discharge pipe connected to its lower end. A sludge discharge valve and a flushing valve are connected in series on the sludge discharge pipe. The rotors in the chambers connected in series along the wood chip conveying direction have increasing rotational speeds, and the pressure plates are arranged at an angle, with auxiliary supports vertically arranged on the sides of the pressure plates.

2. A multi-stage wood chip washing machine according to claim 1, characterized in that, The sludge hopper has an inverted conical structure with a cone angle of 50–70°.

3. A multi-stage wood chip washing machine according to claim 1, characterized in that, The top of the chamber is equipped with an exhaust port, and inspection ports are provided on the top and sides of the chamber.

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