JPH0351020Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sieving machine, and particularly to one that sieves highly agglomerated fine particles with a separation diameter of 150 μm or less.

(Prior Art) The present applicant previously proposed a sieve machine with a relatively thin wire diameter as a sieve machine suitable for sieving fine particles such as talc and calcium carbonate that have strong cohesive properties and a separation diameter of 150μ or less. A sieve screen that is woven from wire material with low rigidity, has a relatively fine mesh, and has a low tension; We have proposed a sieve machine consisting of a sieve device consisting of sieve screens stacked one above the other and with high tension, and an excitation means for hitting the sieve screen on the lower side of the sieve device in a hammer-like manner. Utility Application No. 62-57177).

(Problem to be Solved by the Invention) By the way, in the sieve device of the sieve machine mentioned above, the two upper and lower sieve screens are integrally connected via hooks at both ends, which are the front and back with respect to the conveying direction of the sieved material. The two sieve screens are tensioned at the same time by being adhesively bonded, and one hook is fixedly locked and the other hook is engaged with a hook bolt type tensioning means. However, with such a tensioning mechanism, (1) it is extremely difficult to simultaneously apply appropriate tension to both nets, which have different properties, and (2) the upper net is prone to distortion and wrinkles, so it is necessary to (3) With the hook bolt type tensioning means, the tension of the sieve screen tends to loosen due to vibration during the sieving operation, reducing the sieving efficiency.

The present invention was developed in view of the above-mentioned circumstances, and it is possible to give appropriate tension to the upper and lower sieve screens, to tension the upper sieve screen uniformly, and to maintain the tension of the sieve screen. The purpose of the present invention is to provide a sieve equipped with a tensioning mechanism that does not loosen the tension.

(Means for Solving the Problems) In order to achieve the above object, the present invention integrally joins one end side of the sieve meshes stacked one above the other through one hook, and fixes the hook. In addition to being locked, the other end engages with separate and independent tensioning means via upper and lower hooks, and furthermore, an air cylinder is used as the tensioning means for the upper sieve screen. In other words, the present invention has a relatively thin wire diameter,
It is woven from wire rods with low rigidity and has a relatively fine mesh, and it is woven from wire rods with relatively thick wire diameter and high rigidity and has a relatively coarse mesh. a sieve screen device formed by stacking sieve screens on top of each other; and an impacting body that is disposed on the side of the sieve screen device and strikes the lower surface of the sieve screen in the form of a hammer in the sieve device. A sieve machine comprising a plurality of excitation means equipped with a sieve frame and a sieve frame housing the sieve screen device and an impacting body therein,
Both the upper and lower sieve screens in the sieve screen device are integrally joined at the front end side with respect to the conveying direction of the sieved material, and are engaged with upper and lower separate tensioning means at the rear end side. It is characterized by the presence of

(Structure) Hereinafter, the structure of the present invention will be explained in detail based on examples.

Figure 1 is a side view of the sieve according to the present invention, Figure 2 is an external view of the sieve device attached to the sieve, and Figures 3 and 4 are detailed views of parts A and B in Figure 1. It is.

In the figure, reference numeral 1 denotes a sieve screen device, and the sieve screen device 1 has both front and rear ends fixed with respect to the conveying direction of the sieved material, and is arranged to be inclined downward in the sieved material conveying direction. . Reference numeral 2 denotes a plurality of excitation means provided on the side of the sieve device 1 (on the front side in FIG. 1), and each of the excitation means 2 has a
An impact body 3 is provided which hits the lower surface of the machine in a hammer-like manner. Reference numeral 4 denotes a sieve frame that houses the sieve screen device 1 and impact body 3 therein, and the sieve frame 4 has an opening connected to a chute (not shown) in the center of the lower surface, and an input port 5 in the upper side wall. , a discharge port 6 is provided in the lower end wall.

Now, to explain the configuration of the sieve screen device 1 in detail, the device 1 consists of two sieve screens 7 and 8 stacked one above the other, and the upper sieve screen 7 has a relatively thin wire diameter. (0.026 to 0.105 mmφ) and is woven from metal wire with low rigidity, and has a relatively fine mesh (100 mesh, opening 0.149 mm). On the other hand, the lower sieve screen 8 is woven from a metal wire material with a relatively thick wire diameter (0.870 to 0.590 mmφ) and high rigidity, and has a relatively coarse mesh (6 to 16 meshes). . Both the sieve screens 7 and 8 are integrally adhesively bonded via one hook 9 on the front end side with respect to the transport direction of the sieved material, and the upper and lower sides are separated on the rear end side. It is adhesively bonded to the hooks 11,12.

Next, the mechanism for attaching the sieve screen device 1 configured as described above to the sieve frame 4 will be explained in detail. A hook bolt 14, which is a mounting member and has a hook at its tip and a screw thread at its base end, is screwed into the vicinity of both ends of the mounting member 13 via a nut 15, and the nut 15 is tightened. By adjusting the hook by loosening or loosening the hook, the hook can be moved back and forth with respect to the conveying direction of the sieved material. A plurality of air cylinders 16 are arranged slightly above the hook bolt 14 in a direction perpendicular to the conveyance direction of the sieved material at approximately equal intervals, and the base end thereof is connected to a bracket 17.
is supported on the mounting member 13 via
A hook 19 is fixed to the tip of each piston rod 18. Further, each air cylinder 16 is connected to a common compressed air source 23 via a separate switching valve 21 and pressure reducing valve 22. Note that 24 is a tension portion, and 25 is a front hook locking member.

(Function) When attaching the sieve screen device 1 to the sieve frame 4 in the device configured as described above, first the front end side hook 9 of the sieve screen device 1 is locked to the front hook locking member 25. Next, the hooks 11 and 12 on the rear end side of the sieve device 1
The lower hook 12 is engaged with the hook of the hook bolt 14, and the nut 15 is adjusted to give the lower sieve screen 8 a predetermined tension. Further upper hook 1
1 is locked to the hook 19 at the tip of the air cylinder 16, and the rod side and head side of the air cylinder 16 are communicated with the air supply side and the exhaust side of the switching valve 21, respectively, and the piston rod 18 is retracted. A predetermined tension is given to the upper sieve screen 7.

At this time, by appropriately adjusting the individual pressure reducing valves 22, the individual piston rods 18 are retracted with different strokes, thereby absorbing distortions and wrinkles on the sieve screen surface. In the sieve screen device 1 attached to the sieve frame 4 in this manner, the tension of the upper sieve screen 7 is lower than that of the lower sieve screen 8.

In such a sieve machine, when the excitation means 2 is operated while supplying a sieved material made of highly cohesive fine particles from the inlet 5 of the sieve frame 4, the impactor 3 moves through the lower sieve in the sieve screen device 1. The lower surface of the net 8 is continuously struck. The sieve screen 8 has a high tension, so the vibrations caused by the impact body 3 are widely transmitted without being attenuated, and the sieve screen 8 vibrates uniformly and strongly over the entire surface. This vibration is almost simultaneously transmitted to the upper sieve screen 7, and the sieve screen 7 also vibrates uniformly and strongly over the entire surface, so that the sieved material does not clog the upper sieve screen 7, and fine particles can be efficiently sieved without agglomeration.

Note that the upper sieve screen 7 gradually extends in the longitudinal direction due to vibrations during the sieving operation, but the pressure reducing valve 22
Due to this action, compressed air in an amount proportional to the elongation of the sieve screen 7 is supplied to the rod side of the air cylinder 16, and the piston rod 18 is retracted accordingly, automatically maintaining the initial tension of the sieve screen 7. be done.

(Effect of the invention) According to the invention as described above, one end of the upper and lower sieve screens in the sieve screen device is joined together and fixedly locked, and the other ends are respectively engaged with separate tensioning means. Because they are tied together, it is easy to give different tensions to the upper and lower sieve screens. In other words, the lower sieve screen, which is woven from a wire rod having a relatively large wire diameter and high rigidity, can be given a high degree of tension to increase the vibration transmission rate. In addition, the upper sieve screen, which is woven from wire rods with a relatively small wire diameter and low rigidity, is given a low overall tension to prevent deformation of the screen and to reduce the pressure of multiple air cylinders. It is possible to individually adjust the tension to give different tensions to different parts, thereby forming a mesh surface that is free from distortion and wrinkles.

Furthermore, in the present invention, the upper sieve screen is tensioned via an air cylinder, and the pressure of the cylinder is designed to be kept constant by a pressure reducing valve, so that the tension of the sieve screen is equal to that of the sieve. It will not come loose due to vibration during separation work. For these reasons, the lower sieve screen is vibrated uniformly and strongly over its entire surface by the impact of the impacting body 3, and accordingly, the upper sieve screen is also vibrated uniformly and strongly over its entire surface. ,
Even when fine particles with a separation diameter of 150 μm or less are targeted, effective sieving is possible without clogging of the sieve screen and without agglomeration of the fine particles.

In the embodiment, only the upper sieve screen in the sieve screen device is tensioned via the cylinder, but the lower sieve screen may also be tensioned in the same manner.

[Brief explanation of the drawing]

Figure 1 is a side view of the sieve according to the present invention, Figure 2 is an external view of the sieve device attached to the sieve, and Figures 3 and 4 are detailed views of parts A and B in Figure 1. It is. 1: Sieve screen device, 2: Excitation means, 3: Impact body,
4: Sieve frame, 7, 8: Sieve net, 14: Hook bolt,
16: Air cylinder, 11: Rear end side hook, 1
8: Piston rod, 19: Hook, 22: Pressure reducing valve, 23: Compressed air source.

Claims (1)

[Scope of utility model registration request] It is woven from a wire rod with a relatively small wire diameter and low rigidity, and a sieve screen 7 made into a relatively fine mesh, and a wire rod with a relatively thick wire diameter and high rigidity. , a sieve screen device 1 formed by stacking sieve screens 8 having a relatively coarse mesh one above the other; A sieve machine consisting of a plurality of excitation means 2 equipped with an impact body 3 that strikes the lower surface of the 8 in a hammer-like manner, and a sieve frame 4 housing the sieve screen device 1 and the impact body 3 inside. Both the upper and lower sieve screens 7 and 8 in the sieve screen device 1 are integrally joined at the front end side with respect to the conveyance direction of the sieved material, and the upper and lower screens are separated at the rear end side. At least the tensioning means of the upper sieve screen 7 is fixed to a plurality of air cylinders 16 and to the tip of each piston rod 18 of the cylinders 16, and the upper sieve screen 7 is engaged with a tensioning means. A hook 19 that engages with the hook 11 on the rear end side of the net 7, a compressed air source 23 that communicates with the cylinder 16 through separate pneumatic circuits, and a pressure reducing valve incorporated in each of the pneumatic circuits. A sieve machine characterized by comprising: 22.