GB2160121A

GB2160121A - Pulveriser

Info

Publication number: GB2160121A
Application number: GB08415083A
Authority: GB
Inventors: Chen Chang Mao
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-06-13
Filing date: 1984-06-13
Publication date: 1985-12-18
Also published as: GB2160121B; GB8415083D0

Abstract

A pulverizer includes a housing 1 having an upper body portion 1a and a lower body portion 1b which are hinged together. A circular V-shaped grinding race 2 is mounted in the lower body portion 1b, and a transmission mechanism 3 is mounted at the centre of the lower body portion. A grinding wheel 4 is driven by the transmission mechanism 3, and is rotatable along the circular V-shaped grinding race 2. Selector means, for particle size regulation, 5 are mounted on the outer surface of the upper body portion (1A), and an exhaust fan 6 is mounted at the top of the upper body portion. <IMAGE>

Description

SPECIFICATION Pulverizer The present invention relates to an improved pulverizer.

It is the primary object of the present invention to provide a pulverizer which is equipped with a circular V-shaped race rigidly attached to a main frame.

It is another object of the present invention to provide a pulverizer which is equipped with a water jacket.

It is still another object of the present invention to provide a pulverizer which is firmly supported.

It is still another object of the present invention to provide a pulverizer whereby it is possible to obtain particles of desired dimensions.

Other objects and merits and a fuller understanding of the present invention will be obtained by those having ordinary skill in the art when the following detailed description of the best mode contemplated for practicing the invention has been read in conjunction with the accompanying drawings wherein like numerals refer to like or similar parts and in which: Figure 1 is a partially sectional front view of a pulverizer according to a preferred embodiment of the present invention; Figure 2 is a partially sectional top view of the pulverizer; Figure 3 is a detail view of the grinding means of the pulverizer; Figure 4 is a detail view of the selector means of the pulverizer; and Figure 5 sectional top view of the selector means of the pulverizer.

Referring now to the drawings and in particular to FIGS. 1 and 2 thereof, the pulverizer according to the present invention comprises a housing (1) having an upper body portion (la) and a lower body portion (1b), a circular V-shaped grinding race (2) mounted in the lower body portion (1b), a transmission mechanism (3) mounted at the center of the lower body portion (1b), a grinding wheel (4) driven by the transmission mechanism (3) and rotatable along the circular V-shaped grinding race (2), selector means (5) for choosing desired particles, and an exhausting fan (6) disposed on the top of the upper body portion (1a).

The housing (1), which is cast in iron, is composed of the upper body portion (1a) and the lower body portion (lib). The upper body portion (la) is in the shape of a frusto-conical shell. The upper body portion (1a) is connected at one side with the lower body portion (1b) by a hinge (11) and fixed at the other side by a screw (13) extending into the lower body portion (1b) through flange (12). The lower body portion (1b) is an open cylinder with supporting legs (14). A sleeve (16) is provided on the center of the bottom of the lower body portion (1b) for supporting the transmission mechanism (3) and will be described in detail hereinafter. The lower body portion (1b) has an opening (17) through which the raw material stored in a hopper (18) attached to the opening (17) can fall into the housing (1) to be powdered.The sleeve (16) and the lower body portion (1b) are formed with a flange (19) for supporting the circular V-shaped race (2). Further, a water inlet (101) and a water outlet (102) are respectively provided on the lower body portion (1b). The water inlet (101) is located just above the bottom (15) of the lower body portion (1b) while the water outlet (102) is located just below the flange (19). A rectangular hole (10) is provided on the upper body portion (1a) for letting in air.

The circular grinding race (2) is, which is Vshaped in cross section, supported on a packing (22) disposed on the flanges (19) of the sleeve (16) and the lower body portion (1b) and fastened on the bottom of the lower body portion (1b) by a plurality of screws (23.) A water jacket (100) for receiving cooling water is formed between the lower body portion (1b) and the grinding race (2). The transmission mechanism (3) consists, briefly, of a transmission shaft (31) rotatably disposed within the sleeve (16) and supported by bearings (30), a pulley (32) rigidly attached to the lower end of the transmission shaft (31), a threaded member (33) engaged with square threads (311) of the transmission shaft (31), and a plurality of arms (34) fixedly attached at one end to flange (332) of the threaded member (33).The transmission shaft (31) is formed at the top end with two threaded portions (312) and (313) (not shown) respectively engaged with an adjustable nut (36) and a jam nut (314), and connected at the other end with an oil seal (37) and a nut (38) under the sleeve (16). The threaded member (33) can be adjusted in height by releasing the nut (36) and the jam nut (314). Above the transmission shaft (31) is a cover (39) fastened on the threaded member (33) by screws (35). An oil seal (37) is provided between the threaded member (33) and the sleeve (16) thereby preventing dust or the like from contaminating the interior of the transmission mechanism (3).

Turning to FIG. 3, there is shown an enlarged detailed view of the grinding means (4). As may be seen, the grinding means (4) comprises a fixed shaft (41) horizontally firmly fixed on the free end of the arm (34) by a nut (40), a roller (43) having a bearing (42) force-fitted over the fixed shaft (41), grinding wheel (45) removably vertically mounted on the roller (43), and a cover (46) mounted on the open side of the roller (43).

As shown in FIGS. 4 and 5, the selector means (5) is mounted on the outer surface of the upper body portion (1a) and comprises an outer cylinder (53) having two flanges (52) and a number of holes (51) thereon and an inner cylinder (55) having a corresponding number of holes (54). A turning knob (56) is provided on the top of the inner cylinder (55) which is rotatably surrounded by the outer cylinder (53). The outer cylinder (53) is provided at its bottom end with a butterfly valve (57). A handle (58) is provided on the outer surface of the outer cylinder (59), whereby inlet hole (59) on the bottom of the inner cylinder (53) can be adjusted.

The exhausting fan (6) comprises a casing (61), a motor (62) disposed on the top of the casing (61), and a fan (63) mounted into the casing (61) and driven by the motor (62). A sucking hole (64) is provided between the bottom of the casing (61) and the top of the upper body portion (1a). Furthermore, the casing (61) has an outlet (65) through which pulverized material may pass out of the pulverizer.

A driving motor (7) is mounted at one side of the lower body portion (1b). The pulley (32) is driven by the driving motor (7) via a belt (8) and a gear (9).

In operation, a switch (not shown) is first turned on to actuate the driving motor (7), thereby rotating the transmission shaft (31) via the gear (9), the belt (8) and the pulley (32). As the transmission shaft (31) rotates, the threaded member (33) rotates in unison with the transmission shaft (31) through the threaded portions (311) and (331).

Since the arm (34) and the cover (39) are fastened on the threaded member (33), the arm (34), the cover (39) and the threaded member (33) will rotate simultaneously. When the arm (34) rotates, the grinding wheel (4) will rotate about the transmission shaft (31) along the circular grinding race (2).

Meanwhile, the grinding wheel (4) rotates around the fixed shaft (41). When the raw material to be powdered is poured into the lower body portion (16) through the opening (17) from the hopper (18), the raw material will be pulverized by the grinding wheel (4). The heat evolved in the circular grinding race (4) during grinding is cooled by the cooling water flowing through the water jacket (100) via the inlet (101) and the outlet (102).

As the raw material is grinded into powder, the powder will first enter into the exhausting fan (6) through the inlet (64) and then collected in appropriate containers (not shown). Air flows from the inlet (59) of the selector means (5), a hole (54), a hole (51) corresponding to the hole (54), and a hole (10) into the upper body portion (lea). The flow rate of air entering into the upper body portion (1a) can be adjusted by moving the handle (58) to fix in a hole (50). Since the powder of smaller sizes will float on the top, it is possible to obtain the particle of desired sizes by adjusting the knob (56) to open the desired holes (51) and (56).In other words, if the holes (51) and (56) located at the lower part of the inner cylinder (53) and outer cylinder (55) are desired, the air will enter into the upper body portion (1a) from the lower part of the cylinders (53) and (55) thereby blowing out the particles of larger sizes from the outlet (65). If the holes (51) and (56) located at the middle portion of the cylinders (53) and (55) are opened, the particles of middle sizes can be collected. Similarly, if the holes (51) and (56) at the upper portion of the cylinders (53) and (55) are opened, the particles of smallest sizes are obtained. The air flows rate depends on the properties of the raw material and is controlled by the butterfly valve (57).The size of the particle produced can be controlled by adjusting the threaded member (33) and the engagement of the nut (36) with the transmission shaft (31) to regulate the height of the arm (34). Consequently, the clearance between the grinding wheel (4) and the circular Vshaped race (2) can be regulated, thereby controlling the size of the particle produced. The grinding wheel (4) is made of resilient sheet steel, so that it can be operated smoothly even if the raw material to be grinded comprises rather hard impurities.

Moreover, at the time of overloading, the arm (34) cannot be moved in agreement with the transmission shaft (31), resulting in a relative motion between the threaded member (33) and the transmission shaft (31). Accordingly, the threaded member (33) is moved upward which in turn lifts the arm (34), thereby increasing the clearance between the grinding wheel (4) and the circular Vshaped race (2). When all dragging force are eliminated, the arm (34) will return to its original state so that the bearings (30) and (42), the grinding wheel (4) and the circular V-shaped race (2) will be prevented from wearing in the event of overloading. Furthermore, in order to repair the mechanism therein, simply set free the screw (13) and turn over the upper body portion (lea).

Although this invention has been described with a certain degree of particularity, it is understood that the present disclosure has been made by way of example only and that numerous changes in the detail of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as hereinafter claimed.

Claims

1. A pulverizer comprising: a housing having an upper body portion and a lower body portion which are hinged together; a circular V-shaped grinding race mounted in said lower body portion; a transmission mechanism mounted at the center of said lower body portion; a grinding wheel driven by said transmission mechanism and rotatable along said circular Vshaped grinding race; selector means mounted on the outer surface of said upper body portion; and an exhausting fan mounted at the top of said upper body portion.

2. A pulverizer as claimed in claim 1, wherein said transmission mechanism is supported by a sleeve provided on the center of the bottom of said lower body portion.

3. A pulverizer as claimed in claim 1, wherein said lower body portion has an opening through which raw material stored in a hopper attached to the opening can enter into said housing.

4. A pulverizer as claimed in claim 2, wherein said sleeve and said lower body portion are provided with a flange for supporting said circular Vshaped race.

5. A pulverizer as claimed in claim 1, wherein a water jacket is formed between said lower body portion and said circular grinding race.

6. A pulverizer substantially as herein described with reference to and as shown in the accompanying drawings.