JPH0227880Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention is a mixing machine that efficiently stirs and mixes two or more types of powder materials, and has a simple configuration that prevents the rotating drum from being charged. Regarding antistatic devices for machines.

[Technical background of the invention] In general, a mixer that mixes two or more types of powdered materials that require mixing operations, such as powdered foods, feed, and resin materials, is, for example,
The one shown in Publication No. 4579 has been developed, and its structure will be explained with reference to Figures 1 and 2. 1 is a base plate made of steel frame in a rectangular shape, with supports protruding from the center of the left and right ends. The shafts 2, 2' are rotatably supported on the upper end of the column 3, and rotating shafts 5, 5' are arranged parallel to each other at the ends on the base plate 1 via bearings 4, 4'. Friction wheels 6, 7 are provided at both ends of these rotating shafts 5, 5', and pulleys 8, 9 are provided near the center.
are installed respectively. Reference numeral 10 denotes an electric motor with a reducer installed vertically on the back surface of the base plate 1, and a belt 11,
The friction wheels 6 and 7 of the rotating shafts 5 and 5' are connected to the pulleys 8 and 9 through the pulleys 12 and rotated in the same direction.
Reference numeral 13 denotes a speed reducer in which one ends of two links 14 and 14' are pivotally supported to each other, one link 14 is pivotally connected to the rear end of the base plate 1, and the other link 14' is installed on the base 15. When the speed reducer 16 is driven by an electric motor 18 via a belt, the crank mechanism 13 moves the base plate 1 around the spindles 2 and 2' of the seesaw. It sways like that. And the base plate 1
A hollow cylindrical rotating drum 19 is rotatably mounted on the top via friction wheels 6 and 7, and a plurality of scraping plates 20 are installed inside the rotating drum 19 along the length direction of the drum. is provided, and a lid body 21 is attached to the opening. Further, guide rails 22, 22' are provided around the center of the outer peripheral surface of the rotating drum 19 at a constant interval.
A support roller 23 is loosely fitted in between with the rotating drum 19 in between, and the support roller 23 is attached to a pair of support legs 24 upright at both ends of the base plate 1 via pins 25 so as to be able to rise and fall. The support roller 23 is rotatably attached to the tip of the arm 26 with its circumferential surface facing the guide rails 22 and 22'. The connection relationship between the support leg 24 and the arm 26 is achieved by inserting the pin 25 attached to the support leg 24 into an elongated hole (not shown) provided in the arm 26 to connect the arm 26 to the support leg 26.
The support leg 2 is vertically and rotatably connected to the supporting leg 2.
4 has a fixing plate 27, and arm 26 has a fixing plate 27.
As shown in FIG.
8 on the fixing plate 27, and by tightening the screw shaft (not shown) of the handle 29 screwed onto the arm 26, the arm 26 is fixed upright to the support leg 24, and the handle 29 is loosened and the arm 26 is moved upward. lift,
When the lock plate 28 is unlatched, the arm 26 can be tilted and held behind the rotating drum 19, as shown by the two-dot chain line in FIG.

The mixer is constructed as described above, and its operation is as follows:
Rotating drum 19 containing contents requiring mixing
is placed on the friction wheels 6, 7, the arm 26 is fixed upright, and the support roller 23 is placed on the guide rails 22, 2.
It fits loosely between 2'. In this state, the electric motors 10, 18
When the rotary drum 19 is started, the rotating drum 19 rotates and swings like a seesaw by the crank mechanism 13 via the base plate 1. As a result, the rotating drum 19
The contents inside the drum 19 are scraped up by the scraping plate 20, and can be stirred and mixed well by moving back and forth within the drum 19.

[Problems with background technology]

In the mixer configured as described above,
The friction wheels 6 and 7 that slide on and rotate the rotating drum 19 are made of metal wheels coated with rubber, and when the rotating drum 19 swings,
The support roller 23, which collides with the guide rails 22, 22' and prevents the rotary drum 19 from falling off the friction wheels 6, 7, has ball bearings covered with rubber on its outer periphery. This is to reduce the noise generated inside. However, during the operation of the rotating drum 19, frictional electrification (generation of static electricity) occurs due to sliding contact with an insulating material such as rubber coated on the friction wheels 6, 7 and the support roller 23, which prevents mixing. Necessary materials (for example, resin material powder and powder) were sometimes adversely affected. That is, powder,
The powder is charged and adsorbed to the inner surface of the rotating drum 19, making it difficult to perform the mixing operation properly. The frictional electrification also occurs between objects that require mixing or between the mixture and the rotating drum 19. If the amount of charge due to frictional charging becomes large, when a human body touches the rotating drum 19, it may receive a large shock, or sparks may be generated due to frictional charging, and depending on the mixed material, there is a risk of igniting dust or inducing an explosion. It was hot.

For this reason, conventionally, for example, as shown in FIG. A current collecting member 31 such as a chain or a chain is brought into contact with the surrounding surface of the rotary drum 19, and the frictional charge generated by the operation of the rotating drum 19 is caused to flow through the current collecting member 31 to the earth, or as shown in FIG. A metal band 3 is placed around the drum 19 within a range that does not interfere with its rotation and swinging operation.
2 and attach it to the base plate 1, and this metal band 32
The current collecting member 31 is suspended from the top of the rotating drum 1.
9, the frictional charge was caused to flow to the ground, thereby solving the adverse effects caused by the frictional charge.

However, in order to eliminate the frictional electrification of the mixer using the method described above, many parts such as the support arm 30, metal band 32, and current collecting member 31 are required. This had the drawback of increasing the cost of the machine itself. Also, rotating drum 1
9 from the friction wheels 6 and 7 for cleaning etc., each time the support arm 30 or metal band 3 is removed.
Since the rotary drum 19 had to be removed in advance before being lowered and loaded, the handling of the rotating drum 19 was very time-consuming and troublesome.

[Purpose of invention]

The present invention eliminates the above-mentioned drawbacks and allows the frictional electrification generated during operation of the mixer to easily flow to the ground without using a special current collecting member, thereby eliminating the harmful effects of frictional electrification. Provide a prevention device.

[Summary of the idea]

In this invention, a conductive member is inserted into a buffer member made of rubber or synthetic resin that is coated on the outer periphery of a friction wheel or support roller that comes into sliding contact with the rotating drum, thereby reducing frictional electrification that occurs when the rotating drum comes into sliding contact with the friction wheel. It is characterized in that it flows through the conductive member to the ground.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

The present invention will be described with reference to an example in which it is applied to a support roller that prevents a rotating drum from falling off, and FIGS.
In FIG. 4, parts that are the same as those in FIGS. 1 and 2 are designated by the same reference numerals.

A major feature of the present invention is that the structure of the support roller 23a is different from the conventional one. That is,
As shown in FIG. 3, the support roller 23a fixed to the support shaft 26a fixed to the upper end of the arm 26 is
A ball bearing 26b is attached to the support shaft 26a, a buffer member 26c made of rubber or resin material is attached to the outer periphery of the ball bearing 26b, and a conductive member 26d is driven into the circumferential surface of the buffer member 26c. . The conductive member 26d is made of, for example, aluminum, which has the same hardness as the buffer member 26c.
Use soft materials such as solder and copper. This is to soften the impact applied to the ball bearing 26b when driving the conductive member 26d, and to maintain good contact between the buffer member 26c and the conductive member 26d.
When inserting the conductive member 26d, first insert the insertion hole 26 of the conductive member 26d into the outer periphery of the buffer member 26c.
Drill the required number of holes (3 to 5 locations). (Incidentally, the insertion hole 26e may be drilled before attaching the buffer member 26c to the ball bearing 26b.) Next, the insertion hole 26e has a diameter larger than that of the insertion hole 26e, and a Conductive members 26d whose length is slightly longer than the thickness of the buffer member 26c are sequentially driven into the insertion holes 26e using a light hammer or the like. At this time, since the conductive member 26d is soft like the buffer member 26c, as shown in FIG. The upper end surface of the conductive member 26d is aligned with and has the same height as the outer peripheral surface of the buffer member 26c. As a result, the conductive member 26d is fitted into the insertion hole 26e of the buffer member 26c in a bent state, so that it does not come off due to the centrifugal force generated when the support roller 23a rotates. The rotation of the support roller 23a ensures that the guide rail 22 of the rotating drum 19,
22' can be brought into intermittent contact.

When the support roller 23a provided as described above is replaced with the conventional support roller 23 shown in FIG. 1 and attached to the arm 26 and the mixer is operated, the frictional electrification that occurs during the rotation and oscillation of the rotary drum 19 is reduced. ,
Support roller 23a from guide rails 22, 22'
Conductive member 26d → ball bearing 26b → support shaft 26a
→ Arm 26 → Support leg 24 → Base plate 1 → Support column 3 → Base 15 and can be flowed to the ground.

Note that in the present invention, the conductive member 26d is connected to the support roller 2.
Although the embodiment has been described in which the conductive member 26d is attached to the friction wheels 6 and 7, the invention is not limited thereto, and the present invention can also be achieved by providing the conductive member 26d on the friction wheels 6 and 7 so that the frictional charge flows to the ground.

[Effect of idea]

As explained above, the present invention involves attaching a cushioning member made of rubber or the like to a certain thickness on the outer periphery of a rotating member consisting of a friction wheel and a support roller that is in constant sliding contact with a rotating metal drum. An insertion hole is formed on the outer periphery of the rotary member up to a position reaching the outer periphery of the rotating member, and the insertion hole has a diameter larger than that of the insertion hole and has approximately the same degree of flexibility as the buffer member. A conductive member made of aluminum or the like, whose length is longer than the thickness of the buffer member, is buckled so that it contacts the outer periphery of the rotating member and is fitted in such a way that it does not come off. The drum and the rotating member are electrically connected, and the structure is configured so that the frictional electrification of the rotating drum caused by sliding contact between the rotating drum and the rotating member is reliably conducted to the ground, so it has the following effects. .

In the antistatic device of the present invention, a conductive member having the same degree of softness as the buffer member is attached to the outer periphery of the rotating member, which is coated with a constant thickness on the outer periphery of the rotating member that is in constant sliding contact with the rotating drum. When the conductive member is fitted, the buffer member is often attached with a relatively thin plate thickness. (In other words, the friction wheels and support rollers are usually not formed very thick because they rotate together with the rotating drum, which slows down their wear rate.) As a result, the conductive member can be quickly and reliably formed in a short time. Can be fitted.

Furthermore, when fitting the conductive member into the buffer member, since the conductive member has excellent flexibility and is longer than the board thickness of the buffer member, it is difficult to fit the conductive member into the insertion hole drilled in the buffer member. Since the conductive member is buckled and inserted into the buffer member, even if a centrifugal force acts on a rotating member such as a friction wheel while it is rotating, the conductive member will not fit into the buffer member. Since there is no chance of the drum being caught and coming off, the frictional charge generated on the rotating drum can be reliably channeled to the ground. As a result, the powder material inside the rotating drum is not charged with electricity.
Quick and reliable stirring and mixing is possible. Furthermore, the conductive member is made of a metal material such as aluminum that has almost the same flexibility as the buffer member, and since the conductive member is intermittently in contact with the rotating drum while the rotating member is rotating, The rotating member can be smoothly co-rotated with the rotating drum without causing scratches on the drum or generating noise.

Furthermore, the antistatic device of the present invention eliminates the negative effects caused by frictional electrification by suspending the conductive member from a support arm or the like and making sliding contact with the rotating drum. Since there is no need to require many parts for prevention or to spend time and money on assembly, an antistatic device for a mixer can be manufactured quickly, easily, and economically.

Furthermore, the antistatic device of the present invention can be installed in such a way that it is difficult to tell where it is installed as far as it can be seen from the outside; Since this does not cause any trouble, the rotating drum can not only be handled smoothly, but also the mixer itself can be manufactured in an attractive manner.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the mixer, Fig. 2 is a partially cutaway side view, Fig. 3 is a sectional view showing the main parts of the proposed device, Fig. 4 is an enlarged sectional view of the main parts,
FIGS. 5 and 6 are schematic diagrams showing conventional antistatic devices. 6, 7; Friction wheel, 19; Rotating drum, 26a;
Support roller, 26c; buffer member, 26d; conductive member.

Claims (1)

[Scope of utility model registration request] In a mixer that stirs and mixes the powder materials by rotating a rotary drum containing a plurality of powder materials that need to be mixed, friction wheels 6, 7 or a support roller are in sliding contact with the metal rotary drum 19. A buffer member 26c made of rubber or the like with a predetermined thickness is attached to the outer periphery of a rotating member such as 23a, and an insertion hole 26e is bored in the outer periphery of the buffer member 26c to a position reaching the outer periphery of the rotating member. The insertion hole 26e is made of conductive material such as aluminum, which has a slightly larger diameter than the insertion hole 26e, has almost the same flexibility as the buffer member 26c, and has a length slightly longer than the thickness of the buffer member 26c. Member 26d
is fitted so as to be in contact with the outer peripheral surface of the rotating member in a buckled state, and the rotating drum 19 and the rotating member are electrically connected by the conductive member 26d, and when the rotating drum 19 is in operation, An antistatic device for a mixer, characterized in that a conductive member 26d provided on a rotating member is intermittently brought into contact with the rotating drum 19 to prevent the powder material contained in the rotating drum 19 from being charged by friction.