阅读说明：本技术 一种筒仓无动力滚珠式防拱装置 (Silo unpowered ball type arch preventing device ) 是由 徐志军 张冉冉 程远浩 刘婷婷 原方 陈家豪 刘海林 杜乾 刘军 韩星 郭兆翔 于 2019-12-05 设计创作，主要内容包括：本发明涉及一种筒仓无动力滚珠式防拱装置。该防拱装置包括底座、卡槽、挡板、双头螺柱和滚珠五部分。底座沿筒仓深度方向安装在筒仓侧壁内侧,底座上端设置有凹形卡槽；卡槽中间设置有穿过滚珠圆心的双头螺柱,螺柱的两端穿过带孔的卡槽,在卡槽的外侧分别套上垫圈,拧上螺母,使双头螺柱与卡槽连接成一个整体。卡槽上端及下端均焊接有挡板,防止贮料和其他杂质进入卡槽；该防拱装置具有结构简单,安装方便,无需外部动力,卸料过程中仓壁与颗粒之间的摩擦力即外摩擦力,由滑动摩擦转变为滚动摩擦,其摩擦力减小。在此位置处,仓体内也就难以形成稳定的拱脚,进而降低动态压力,提高卸料的效率,实现绿色卸料。(The invention relates to a silo unpowered ball type arch prevention device. The anti-arch device comprises five parts, namely a base, a clamping groove, a baffle, a double-end stud and a ball. The base is arranged on the inner side of the side wall of the silo along the depth direction of the silo, and a concave clamping groove is arranged at the upper end of the base; the middle of the clamping groove is provided with a double-end stud penetrating through the circle center of the ball, two ends of the stud penetrate through the clamping groove with holes, the outer side of the clamping groove is respectively sleeved with a gasket, and a nut is screwed up to enable the double-end stud and the clamping groove to be connected into a whole. Baffles are welded at the upper end and the lower end of the clamping groove to prevent stored materials and other impurities from entering the clamping groove; the anti-arch device has the advantages of simple structure, convenient installation and no need of external power, and the friction force between the bin wall and the particles in the unloading process, namely the external friction force, is changed from sliding friction to rolling friction, so that the friction force is reduced. At this position department, the storehouse body just also is difficult to form stable hunch foot, and then reduces dynamic pressure, improves the efficiency of unloading, realizes green unloading.)

1. A silo unpowered ball type anti-arch device comprises a base (1), a clamping groove (2), a baffle (3) and a stud (4), and balls (5).

2. The silo unpowered ball type anti-arch device according to claim 1, wherein: the upper end of the ball base (1) is provided with a ball clamping groove (2); a double-end stud (4) penetrating through the circle center of the ball is arranged in the middle of the clamping groove, and right-angled triangular baffles (3) preventing scattered materials and other impurities from entering the clamping groove in the discharging process are arranged at the upper end and the lower end of the clamping groove.

3. The silo unpowered ball type anti-arch device according to claim 2, wherein: the double-end stud (4) adopts a stainless steel shaft, the shaft penetrates through the circle center of a ball, the ball (5) is fixed in a ball clamping groove through the double-end stud, one half of the ball protrudes out of the clamping groove, the arrangement range of the ball (5) in the column direction is the height range of the silo, and the distribution density of the ball is adjusted according to the actual requirements and different silo heights and bearing requirements.

Technical Field

The invention relates to a device for preventing storage materials in a silo from arching in the unloading process, in particular to an unpowered ball type arch prevention device.

Background

For silo discharging, normal outflow of stored materials in the silo body from a discharging opening is of great importance. During the discharging process, the grains are arched, so that the normal grain operation and processing are obstructed, and the blockage phenomenon is easy to occur. More serious, the pressure of the bin wall can be increased sharply when the bin is arched, the stability of the bin body and facilities in the bin is damaged, and even the personal safety of grain surface workers is threatened. Therefore, the problem of grain arching in the silo must be taken into account.

The silo discharging accidents are frequent, and the main reasons are that the stored materials in the silo body repeatedly form grain arches when the silo discharges materials, and the discharging pressure of the silo wall at the action of the arch springing is suddenly increased. During the discharging process, when the stored material is arched, the grain arch obstructs the flow of the stored material. The gravity and inertial forces of the stock above the arch are all borne by the arch, resulting in greater dynamic pressure on the bin wall in contact with the arch springing. Therefore, it is necessary to design an anti-arch device to avoid the formation of stable arch springing, so as to improve the safety and the effective utilization rate of the silo.

At present, the arch breaking method and the device adopt the modes of artificial arch breaking, compressed air arch breaking, arch breaking by adding a stirring device, arch breaking by using an air hammer and the like. However, the application of these methods in practical engineering has certain limitations, and the problem of material storage and arching in the silo cannot be solved well. In view of the above, a new device capable of effectively preventing the inner part of the bin body from arching in the unloading process is urgently needed to be developed.

Disclosure of Invention

The invention aims to provide a ball type unpowered anti-arch device, which mainly aims at solving the problems in the prior art. The problem of bin body damage caused by sudden increase of pressure on the side wall of the silo due to blocking caused by arch formation in the silo in the unloading process of the silo is solved.

The purpose of the invention is realized by the following technical scheme: a silo unpowered ball type arch prevention device comprises a base, a clamping groove, a double-end stud and balls. The ball bearing is mainly characterized in that a ball bearing clamping groove is formed in the upper end of the ball bearing base; the stud penetrating through the axle center of the ball is arranged in the middle of the clamping groove, and the ball rotates around the stud; the balls are fixed on the left side and the right side of the ball clamping groove through the double-end studs; baffles for preventing scattered materials and other impurities from entering the clamping groove in the discharging process are arranged at the upper end and the lower end of the clamping groove; the anti-arch devices are distributed on the side wall of the vertical silo in a row along the depth direction of the vertical silo.

The principle of the anti-arching device is that grain arching effect is a common phenomenon for particulate matter such as grains. During the discharging process, if the storage material is arched, the storage material and the bin wall reach a relative balance state during the arching. Namely, the storage materials in the bin move relatively under the action of self weight, and the pores among the particles are continuously compressed under the action of vertical stress, so that the discrete particles are wedged tightly, and the arching phenomenon appears in a certain range. The grain storage material is isotropic granular bulk on the whole, the transverse section and the longitudinal section of the silo for central unloading are equivalent to cross sections under the action of axial tension, and the surfaces have no shear stress, so that an arch surface formed by arching cannot bear bending moment, namely the bending moment at the arch surface is zero. In addition, when the storage material is in a balanced state, the side wall of the silo needs to have arch foot supporting force with enough strength, and when the granular particles rotate slightly, the vertical pressure of the upper part is mutually transmitted at a new position, but the phenomenon of vacancy can not occur in the transmission of the pressure in the arch. Four rows of unpowered ball type arch preventing devices are respectively arranged on the side wall of the silo along the depth direction at 90 degrees, 180 degrees, 270 degrees and 360 degrees of the circular silo wall, on one hand, balls are arranged in rows, so that the arch surface to be formed is locally unstable, and the arch surface structure to be formed is damaged; on the other hand, the side wall ball rotates under the action of vertical stress of the storage material, even if sliding friction is converted into rolling friction, the friction of the inner side wall of the bin is reduced, and the possibility of arch formation is reduced, so that the aim of arch prevention is fulfilled.

The anti-arch device has the beneficial effects that when the discharge opening is opened to start discharging, the ball arranged on the bin wall rotates under the action of the gravity of the stored material, and the friction force between the stored material in the bin body and the bin wall is converted into rolling friction from sliding friction. And the friction force between grain particles and the silo wall directly influences the discharging smoothness and the arching condition in the silo discharging process. The unpowered rolling type arch breaking device reduces the friction force between the side wall of the bin body and particles to a great extent, and prevents the formation of an arch under the mutual wedging action of the particles in the discharging process, thereby achieving the effect of reducing dynamic pressure.

The invention is characterized in that the arch breaking device and the method are different from the existing arch breaking device and method which rely on power modes such as manpower or vibration arch breaking, compressed air arch breaking, arch breaking by adding a stirring device, arch breaking by using an air hammer and the like. The device is an unpowered rolling type anti-arch device, and the balls on the inner side wall of the silo rotate by means of the inertia force in the silo discharging process, so that the friction between particles and the wall surface is changed from sliding friction to rolling friction, and the friction force is reduced. At this position department, the ball receives the external friction effect to rotate incessantly, and the storehouse is internal just also to be difficult to form stable hunch foot, and then reduces dynamic pressure, improves the efficiency of unloading, realizes green unloading.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a sectional view

FIG. 2 is a plan view

FIG. 3 is a detail of the apparatus;

in the figure, 1 is a base, 2 is a clamping groove, 3 is a baffle, 4 is a stud and 5 is a ball.

Detailed Description