JPH0415307Y2 - - Google Patents

Description

【考案の詳細な説明】[Detailed explanation of the idea]

〈産業上の利用分野〉 この考案は、粒度と比重が異なる粒子の混合体
である原料を上下に脈動する液中に設置した床網
面上に供給して、比重選別後、分割排出する固定
網式ジグ選別機の低比重粒子排出装置に関する。 〈従来の技術〉 実開昭61−106347号公報に開示されているジグ
選別機を第３図に示し、これによつて従来技術を
簡単に説明する。 矩形状をなすジグ箱１の底に床網２を取付けて
フレーム３に固定し、ジグ箱１の下方にはダイヤ
フラム４を介して下部ホツパ５を垂設し、その下
部ホツパ５を垂直揺動装置（図示せず）により上
下動可能とする。原料Ｆおよび水Ｗを投入ホツパ
６から送り込むと、ジグ箱１内を流れる間に、床
網２を通じて原料Ｆは上下に脈動し、上部に低比
重粒子層ａ、下部に高比重粒子層ｂを形成して分
離される。床網２の目より大なる高比重網下粒子
は掻出羽根装置８によつて排出ホツパ９へ掻き出
し、床網２の目より小さい高比重網上粒子は下部
ホツパ５下端に開口した排出口７から水と共に排
出し、また、掻出羽根装置８の回転により定まる
或るレベルを保つた低比重粒子層ａの低比重粒子
は、機幅一杯に設けた越流板１０を水の脈動と押
し流し水の水流によつてのり越えさせ、排出樋１
１より系外へ分離排出するようになつている。 〈考案が解決しようとする問題点〉 上記したジグ選別機をコンクリート用骨材を得
るための砕石選別に用いた場合、良質の骨材とな
り得る高比重網上粒子は掻出羽根装置８でどんど
ん掻出して処理量をふやすようにする一方、骨材
として不適な低比重粒子は越流板１０を越えて排
出樋１１から排出し、製品である高比重網上粒子
に混入させないようにする必要がある。 ところが掻出羽根装置８の回転数をあげて高比
重網上粒子の排出量を増すと、これに伴つて低比
重粒子層ａのレベルが下がるから、多量の押し流
し水と大きな脈動を与えることで越流板１０をの
り越えさせざるを得なかつた。しかし、低比重粒
子層ａのレベルが下がり過ぎると、それによつて
も越流板１０をのり越えられなくなるから、掻出
羽根装置８の回転数アツプは自ら制約を受け、処
理量をふやせない原因となつていた。 また、ジグ箱１の両側板と越流板１０とで作る
コーナー部分に集まつた低比重粒子の摩擦力は、
それ以外の越流板個所における摩擦力よりも倍程
度にふえるため、越流排出が特に困難であり、こ
のため低比重粒子が高比重網上粒子層ｂ側へもぐ
り込む率を多くし、製品である高比重網上粒子中
に低比重粒子が混入する割合を高めるといつた不
都合を生じさせた。ちなみに機幅900mmと1500mm
の装置で上記した不都合を生じない有効幅につい
て調べてみると、それぞれ約700mm、1300mmとい
う値であり無効幅は以外に大きいことがわかるの
である。 この考案は、水の脈動を大きくしたり、押し流
し水流を多くしたりすることでは解決できなかつ
た上記問題点の解消を、その目的としてなされた
ものである。 〈問題点を解決するための手段〉 この考案では、越流板は少なくともその上端部
分を進行方向へ傾斜させ、越流板の手前には上端
に向けて噴き上げる噴流配管を越流板に平行に配
設すると共に、噴流配管から噴き上げる噴射水の
案内板を傾斜角調整装置で任意の角度に設定可能
としてなり、噴射水の援助によつて所期の目的を
達成した。 〈実施例〉 この考案を第１図に示した実施例によつて説明
すると、つぎのとおりである。 第１図を従来例の第３図と比例すると、この考
案は、下記の点で従来のものと相異することがわ
かる。すなわち、越流板１０は少なくともその上
端部分１０ａを進行方向へ傾斜させている点、越
流板１０の手前には上方に向けて噴き上げる噴流
配管１２が越流板１０にほぼ平行となるように配
設されている点、および上記した噴流配管１２か
ら噴き上げる噴射水の案内板１４が傾斜角調整装
置１５によつて任意の傾斜角に設定できるように
取付いている点である。第２図は、この考案の要
部を示している。 図示の例では、越流板１０の上端部分１０ａだ
けを進行方向へ傾斜させているが、越流板１０全
体が傾斜するようにしたものでもよい。好適な傾
斜角θは15°〜20°といつた程度である。傾斜角θ
をこれよりも大きくすると、脈動による効果の減
少分の方が利いてしまい、越流板の点からすると
有効とはいえないし、また、逆にθ小さくする
と、のり越え易さが失われて、従来のθが零の場
合と同じことになる。 噴流配管１２に穿設される噴射口１３はスリツ
トでも孔でもよいが、例えば孔の場合ならば、ジ
グ箱１の側板側に近づくにつれて孔ピツチを段々
狭めるなどして、前述したコーナー部分での排出
の困難さを払拭することができる。噴流配管１２
の配設位置は低比重粒子層ａ内にとどめ、高比重
粒子層ｂには及ばないようにする。 噴射水の案内板１４はジグ箱１の機幅一杯に設
け、一端は回動自在に枢着し、他端は傾斜角調整
装置１５と連結する。傾斜角調整装置１５は例え
ばハンドルを廻すことによつてネジ杆を昇降さ
せ、そのネジ杆の下端部で案内板１４と連結する
ような構造が採用できる。 つぎにこの装置の使用法について述べると、脈
動の大きさと水Ｗの量は最適比重選別の見地から
定め、低比重粒子の排出については、低比重粒子
の粒径、比重、形状といつた条件に応じて、傾斜
角調整装置１５を操作して案内板１４の角度を変
えることで噴射水の方向を調整したり、或いは噴
射水量、噴射圧を調節したりすることで、確実に
越流板１０をのり越えて排出するようになす。 〈考案の効果〉 以上のとおり、この考案は噴射水流の援助によ
つて低比重粒子の越流排除を行なうようにしたも
のであるから、低比重粒子層ａのレベルが降下し
ても円滑な越流排除に変わりなく、したがつて従
来の掻出羽根装置８の回転数増に関する制限を撤
廃して処理量の倍増を可能とする。また、越流板
１０の少なくとも上端部分１０ａを進行方向へ傾
斜させ、噴射水の噴射方向も可変としたことで、
例えば同じ脈動の大きさでも大きな粒径のもが排
除できる。ちなみに、その一例を示すと、下表の
とおりである。 <Industrial Application Field> This idea is a fixed method in which a raw material, which is a mixture of particles with different particle sizes and specific gravity, is supplied onto a bed screen installed in a liquid that pulsates up and down, and after specific gravity separation, it is separated and discharged. This invention relates to a low-density particle discharge device for a net-type jig sorter. <Prior Art> A jig sorting machine disclosed in Japanese Utility Model Application Publication No. 61-106347 is shown in FIG. 3, and the prior art will be briefly explained using this figure. A floor net 2 is attached to the bottom of a rectangular jig box 1 and fixed to a frame 3. A lower hopper 5 is vertically disposed below the jig box 1 via a diaphragm 4, and the lower hopper 5 is vertically oscillated. It can be moved up and down by a device (not shown). When the raw material F and water W are fed from the input hopper 6, the raw material F pulsates up and down through the bed net 2 while flowing in the jig box 1, forming a low specific gravity particle layer a in the upper part and a high specific gravity particle layer b in the lower part. formed and separated. High-density under-screen particles larger than the mesh of the floor screen 2 are scraped out by a scraping blade device 8 to a discharge hopper 9, and high-density upper-mesh particles smaller than the mesh of the floor screen 2 are scraped out through a discharge port opened at the lower end of the lower hopper 5. The low specific gravity particles in the low specific gravity particle layer a, which are discharged together with the water from the device 7 and maintained at a certain level determined by the rotation of the scraping blade device 8, are removed by using an overflow plate 10 provided over the entire width of the machine to counteract the pulsation of water. The flow of water washes over the discharge gutter 1.
1, it is designed to be separated and discharged outside the system. <Problems to be solved by the invention> When the above-mentioned jig sorter is used to sort crushed stone to obtain aggregate for concrete, high-density mesh particles that can become good quality aggregate are rapidly removed by the scraping blade device 8. While scraping out the particles to increase the throughput, it is necessary to discharge low specific gravity particles unsuitable as aggregate from the discharge gutter 11 beyond the overflow plate 10 to prevent them from mixing with the high specific gravity particles that are the product. There is. However, when the number of revolutions of the scraping blade device 8 is increased to increase the amount of high-density particles on the screen, the level of the low-density particle layer a decreases. I had no choice but to climb over the overflow plate 10. However, if the level of the low-density particle layer a drops too much, it will no longer be able to pass over the overflow plate 10, so the rotational speed of the scraping blade device 8 will be subject to its own limitations, which is the reason why the throughput cannot be increased. It was becoming. In addition, the frictional force of the low specific gravity particles gathered at the corner formed by the side plates of the jig box 1 and the overflow plate 10 is as follows:
Since the frictional force is approximately twice as high as that at other overflow plate locations, overflow discharge is particularly difficult.As a result, the rate at which low-density particles sneak into the high-density mesh particle layer b increases, resulting in product failure. Increasing the proportion of low specific gravity particles mixed into certain high specific gravity mesh particles caused such inconveniences. By the way, the machine width is 900mm and 1500mm.
When we investigate the effective widths that do not cause the above-mentioned problems with these devices, we find that the values are approximately 700 mm and 1300 mm, respectively, and that the invalid widths are much larger. The purpose of this invention was to solve the above-mentioned problems that could not be solved by increasing the pulsation of the water or increasing the water flow. <Means for solving the problem> In this invention, at least the upper end of the overflow plate is inclined in the direction of travel, and in front of the overflow plate, a jet pipe that blows up water toward the upper end is installed parallel to the overflow plate. At the same time, the guide plate for the jet water spouted up from the jet pipe can be set to any angle using an inclination angle adjustment device, and the intended purpose has been achieved with the aid of the jet water. <Example> This invention will be explained below using the example shown in FIG. Comparing FIG. 1 with FIG. 3 of the conventional example, it can be seen that this invention differs from the conventional one in the following points. That is, at least the upper end portion 10a of the overflow plate 10 is inclined in the traveling direction, and in front of the overflow plate 10, a jet pipe 12 that blows upward is arranged so that it is almost parallel to the overflow plate 10. and that the guide plate 14 for the jet water spouted from the jet pipe 12 described above is attached so that it can be set to any inclination angle by the inclination angle adjustment device 15. FIG. 2 shows the main part of this invention. In the illustrated example, only the upper end portion 10a of the overflow plate 10 is inclined in the traveling direction, but the entire overflow plate 10 may be inclined. A suitable inclination angle θ is approximately 15° to 20°. Inclination angle θ
If θ is made larger than this, the reduction in the effect due to pulsation becomes more effective, and it cannot be said to be effective from the point of view of the overflow plate.On the other hand, if θ is made smaller, the ease of overflowing is lost, This is the same as the conventional case where θ is zero. The injection port 13 drilled in the jet pipe 12 may be a slit or a hole, but if it is a hole, for example, the hole pitch may be gradually narrowed as it approaches the side plate of the jig box 1, so that the injection port 13 can be formed in the corner portion as described above. This can eliminate the difficulty of evacuation. Jet pipe 12
The arrangement position is kept within the low specific gravity particle layer a and does not extend to the high specific gravity particle layer b. The jetted water guide plate 14 is provided over the entire width of the jig box 1, one end is rotatably pivoted, and the other end is connected to the inclination angle adjustment device 15. The inclination angle adjustment device 15 may have a structure in which, for example, a threaded rod is raised and lowered by turning a handle, and the lower end of the threaded rod is connected to the guide plate 14. Next, to explain how to use this device, the magnitude of the pulsation and the amount of water W are determined from the viewpoint of optimal specific gravity sorting, and the discharge of low specific gravity particles is determined based on the particle size, specific gravity, and shape of the low specific gravity particles. By operating the inclination angle adjustment device 15 and changing the angle of the guide plate 14 to adjust the direction of the jetted water, or by adjusting the amount and pressure of the jetted water, the overflow plate can be reliably removed. Make sure to discharge more than 10. <Effects of the invention> As described above, this invention is designed to remove overflow of low-specific gravity particles with the aid of jet water flow, so even if the level of the low-specific gravity particle layer a falls, smooth flow can be achieved. There is no change in overflow elimination, and therefore, the conventional restriction on increasing the number of rotations of the scraping blade device 8 is eliminated, making it possible to double the throughput. In addition, at least the upper end portion 10a of the overflow plate 10 is tilted in the advancing direction, and the jetting direction of the jetting water is also variable.
For example, even with the same pulsation size, large particles can be excluded. Incidentally, an example is shown in the table below.

【表】 更にコーナー部分での噴射水流の増強が至極容
易な構成であるから、機幅一杯の有効活用が初め
て可能となるし、高比重粒子中の低比重粒子混入
率の低減に寄与するところ、大なるものがある。[Table] Furthermore, since the configuration makes it extremely easy to strengthen the jet water flow at the corners, it becomes possible for the first time to effectively utilize the full width of the machine, and this contributes to reducing the proportion of low-specific gravity particles mixed in with high-specific gravity particles. , there is something big.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、この考案になる低比重粒子排出装置
を備えたジグ選別機の説明図、第２図は、その要
部を示す断面図、第３図は従来のジグ選別機の説
明図である。 ２……床網、８……掻出羽根装置、１０……越
流板、１０ａ……越流板の上端部分、１２……噴
流配管、１４……案内板、１５……傾斜角調整装
置。 Figure 1 is an explanatory diagram of a jig sorter equipped with the low-density particle discharge device of this invention, Figure 2 is a sectional view showing its main parts, and Figure 3 is an explanatory diagram of a conventional jig sorter. be. 2... Floor net, 8... Scraping blade device, 10... Overflow plate, 10a... Upper end portion of overflow plate, 12... Jet pipe, 14... Guide plate, 15... Inclination angle adjustment device .

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 上下に脈動する液中に設置した床網２面に原料
Ｆを供給して比重選別し、高比重網上粒子は掻出
羽根装置８で排出し、低比重粒子は越流板１０を
のり越えさせて排出するジグ選別機において、越
流板１０は少なくともその上端１０ａを進行方向
へ傾斜させ、越流板１０の手前には上方に向けて
噴き上げる噴流配管１２を越流板１０に平行に配
設すると共に、噴流配管１２から噴き上げる噴射
水の案内板１４を傾斜角調整装置１５で任意の角
度に設定可能としてなるジグ選別機用低比重粒子
排出装置。 The raw material F is supplied to 2 sides of the floor screen installed in the liquid pulsating up and down, and is subjected to specific gravity separation.Particles with high specific gravity on the screen are discharged by the scraping blade device 8, and particles with low specific gravity go over the overflow plate 10. In the jig sorting machine that discharges the flow, the overflow plate 10 has at least its upper end 10a inclined in the traveling direction, and a jet pipe 12 that blows upward is arranged parallel to the overflow plate 10 in front of the overflow plate 10. A low specific gravity particle discharging device for a jig sorter, in which a guide plate 14 of jet water spouted from a jet pipe 12 can be set to an arbitrary angle with an inclination angle adjusting device 15.