US2977936A

US2977936A - Vibrating motor apparatus

Info

Publication number: US2977936A
Application number: US831438A
Authority: US
Inventors: Hermann Julius
Original assignee: Gewerkschaft Eisenhutte Westfalia GmbH
Current assignee: Gewerkschaft Eisenhutte Westfalia GmbH
Priority date: 1958-08-05
Filing date: 1959-08-03
Publication date: 1961-04-04
Anticipated expiration: 1978-04-04

Description

April 1961 J. HERMANN 2,977,936

VIBRATING MOTOR APPARATUS Filed Aug. 3, 1959 2 Sheets-Sheet 1 April 4, 1961 J. HERMANN VIBRATING MOTOR APPARATUS 2 Sheets-Sheet 2 Filed Aug. 3, 1959 i E \\I\\\\\\\ rlllllll'lllfrlIIIIIIIIIII! I III!!! rlllllilrlviilv 'the within sp 7 2,977,936 VIBRATING' Moron APPARATUS Julius Hermann, Altlunen,

hafi Ei hu Westphalia; Wethmar, near Lu'n'en, Germany,

The present invention relates to vibrating motors and more particularly to vibrating motors for use in coarse coal crushing apparatus.

Air pressure operated vibrating motors of various kinds are known such as those having a freely movingpiston swinging back and forth within a cylinder therefor. The

Germany, assignor to Gewierk l attented Apr. 4, 1961 'icc 2. groove on either side of the trough: 1'0. Laterally conducted spaced chains 12 carrying transverse scraper bars 13 at suitable: intervals therebetween travel in the respective grooves defined by the inwardly projecting rails 11.

. At either end of the conveyor trough 10, suitable chain sprockets (not shown) are situated which conduct chains movement of the piston Within the cylinderis usually controlled. by a plurality of channels provided in. the cylinder and piston for air intake and exhaust.

In these vibrating motors, however, the inflow'port for the compressed air or other propellant is prematurely opened for intake of compressed air into the cylinder chamber before the piston has moved-the desired distance nto the cylinder chamber for the compression stroke, ige. before the airremainingin the cylinderchamberhas been compressed by thfpiston to the same-pressure as the intake air. In this way, compressed air is taken into the cylinder chamber too early in. the compression. stroke of the piston and asia result, ,full compression stroke performance is not attained. This leads to a poor degree of efiiciency of the motor. a p Q I v l i l It is an object of the present invention to overcome the foregoing disadvantages and to provide a, vibrator motor having a control piston means for regulating the compressed air intake which is simple in construction and efficient in operation, v i Other and further objects will become apparent. from ecification and accompanying drawings in which:

Fig. 1 is a side elevation, partially in section of a vibrating crusher apparatus,- disposed on a conveyor trough section, for the comminution of coarse lumps of coal which includes a vibrating motor in accordance with the invention; I

2 is a top view of the crusher of Fig. 1; and Fig. 3 1s a sectional viewof the vibrating motor in accordance with the invention-shown for convenience in vertical position, the top being, the forward end and the bottom being the rearward end as seen in: Fig.1.

It has been found in accordance with theinvention that a vibrating moto r, of excellent eflicienc ma be provided by the inclu y y the compressedair, or other propulsion agent, inlet channel leading to the cylinder chamber, which control piston prevents entry of inlet air into the cylinder chamber until a compression pressure has been reached therein which corresponds to that ofthe inlet air pressure. i I I provision for a recoilvalve, a higher compr sure may be achieved for the intake air than t pressure in the cylinder chamber.

Referring to Figs. 1 and 2, a crushing apparatus is seen which may be of coal recovered from a mining operation before conession preshe operating veying the same in smaller lump form away from the mine face being worked. Conveyor trough 10 is-provided with lateral rails 11 inwardly projecting above: and

sion of a control piston means in By suitable used for example to crush large lumps' over the bottom surface of the trough't'o form a ruimin'g 12 in the desired direction, the chains being returned in the opposite direction below the bottom of conveyor trough 10 in the conventional manner.

The crude coal which has been extracted in the mining operation is introduced over slide 14 via the overlying discharge end 15 of a strut conveyor supplying the crude coal. Below slide 14 is situated a vibrator crusher which crushes the coarse pieces of coal falling from slide 14 and passes the same together with the finer material, flowing through unimpeded. to the conveyor trough for ultimate removal. v V

. The. vibrator crusher includes an inclined chute 16 defining a path in the longitudinal direction of the conveyor trough 10 which forms an acute angle with the vibrating direction indicated in Fig. 1 by arrow 17. Disposed at a suitable distance behind chute 16 and transversely mounted for cooperation therewith is the reinforced fixed counter-plate 18; Counter-plate 18 carries curved crusher strips 19 on its underside generally in the longitudinal direction of the conveyor trough 10 and at a deeper angle than chute 16. Crusher strips 19 form with chute 16 a continuously narrowing wedge-shaped chanriel in thelongitudinal' direction of the conveyor trough 10. Chute 16 is preferably provided with crusher teeth 20 across its surface facilitating the crushing operation. These'teeth 20 have been omitted from Fig. 2 for more convenient illustration of related parts. I

Chute 16 is suitably slidably mounted for vibratory movement on transverse rails 21 which are carried by side plates 22 of the crusher frame. At the rear of the frame, plates 22 are joined to counter-plate 18 while at the forward end they are joined by transverse plate 23. The frame carrying the vibrator crusher is supported for movement along rails 11 of conveyor trough 10 via slides 24. The crusher frame may be connected to conveyor trough 10 or merely disposed thereon via slides 24 and rails 11. i

The vibration of chute 16 is effected by the pneumatic vibrating motor 25' which is mounted at its rear end for vibration directly with chute 16 fixedly connected thereto via wall 35. Motor 25 is flexibly mounted at its forward *urged back and fo'rth 'between teeth 20 and strips 19 by vibratory action in the direction of arrow 17. The desired crushing thereby takes place and the crushed material passes into conveyor trough 10 which conducts the same via chains 12 and scraper bars 13 away from the operation.

Compressed air for motor 25 is fed via line 48 and is discharged via exhaust 69 which conducts the same. into exhaust space 70 for convenient mufiiing of the same and perhaps for cooling of the workingparts.

Referring to Fig. 3 cylinder 27 of the vibrating motor, shown: in vertical .position. for convenience is encased within

jackets

28 and 29 which definetherebetween annular chambers; 30 ands- Separated y n Sealing .collar 49. Screws -32; suitably arranged at; points aro ring portion 46.

65 and exhaust line 69. V V

. 3 and 29 in place. Screws 32 also serve to rigidly mount the motor to wall 35 of chute 16.

The rear cylinder lid 33 carries a hollow cylinder sleeve 36 which slidably receives thereover the hollow rear portion of piston 37. Sleeve 36 is in flow communication with channel 38 leading to exhaust pipe 69 and the atmosphere. Plug 39 at'the end of sleeve 36 is merely provided to close an opening which occurs due 42 encloses spring housing 43 which is connected to stationary plate 23. On account of the continuous vibratory movement of the motor and in turn guide sleeve 42, a bushing 44, such as an open end brass cylinder, is provided between sleeve 42 and housing 43. The vibrations in either direction are therefore readily absorbed by the coil springs slidably mounted over tension screw 41 and under slight tension.

The working piston includes three main pistons, cylindrical portion 37, recessed plug portion 45 and annular These elements are connected for movement in unison within cylinder 27 by means of recessed screws 47 disposed at suitable intervals around the perimeter of the piston. Plug 45 contains the control means for the incoming propulsion agent.

The propulsion agent, such as compressed air, enters the motor via line 48 and passes into annular chamber 30 located between cylinder 27 and jacket 28. From chamber 30, the air passes via ports 50, suitably disposed at intervals around the circumference of cylinder 27, through piston inlet channels 51 of piston portion 37 and into ring chamber 52 of the working pistonJ The force of the compressed air acts against spring 53 to raise spring loaded valve 54 from its seat whereby the air passes into chamber 55.

A disc valve 56 such as one of fiat spring metal separates chamber 55 from main cylinder chamber 57. Disc valve 56 is connected for actuation to a control steppiston 58 seated within plug 45. With the piston 37 in the position shown in Fig. 3 and assuming it is upwardly traveling, the air remaining in chamber 57 is closed off from exhaust ports 65 and therefore becomes compressed.

-When this compression force reaches that of the incoming compressed air in chamber 55, this pressure acts upon the greater frontal surface of step-piston 58 whereby disc valve 56 is unseated. The step-piston and disc valve 56 move in the direction of arrow 63 until valve 56 abuts the forward side of plug 45 so as to allow compressed air to flow into cylinder chamber 57. This causes movement of piston 37 in the opposite direction until exhaust parts 65 are exposed whereby the compressed air is discharged.

During this time, the rearmost side of step-piston 58 is acted upon by the increase in pressure in chamber 59. This is caused by the rearward stroke of the piston compressing air present in annular chamber 61 in flow communication via channel 60 with chamber 59. Since the annular piston surface of piston 37 within chamber 61 is less than the forward piston surface within cylinder chamber 57, piston 37 is caused by the compressed air within chamber 57 to move in the direction of arrow 63. The effective surface for displacement of step-piston 58 is the differential ring surface space at 62. Exhaust bore 64 is provided in plug 45 to connect space 62 with the atmosphere via channel 38.

With respect to intake air and discharge air, compressed air fiowing into chamber 57 moves piston 37 in the direction of arrow 63 so that channels 51 become blocked from compressed air entering at ports 50. The flow of compressed air ceases and as piston 37 moves further, exhaust ports 65 are uncovered and the compressed air is released from chamber 57 through ports The movement of piston 37 in the direction of arrow 63 causes air in chamber 61 to become compressed so as to exert a counter force against the bottom portion of piston 37, a part of this compressed air entering channel 60 and control chamber '59. This causes control piston 58 to move in the opposite direction whereby disc valve 56 is again seated to seal cylinder chamber 57 from chamber 55. Control chamber 59 is suitably closed off by a stopper 66.

Since channel 51 is sealed from contact with parts 50, the air in chamber 52 is no longer suflicient to keep valve 54 open and the same is urged closed by spring 53. Valve 54, of course, must remain closed as soon as piston 37 starts its rearward movement in the direction of arrow 63 in order to permit the expanding air under compression in chamber 57 to work against an efiective piston surface until ports 65 are again exposed.

The air which is compressed in chamber 61 as piston 37 moves in the direction of arrow 63 causes a deceleration of the piston and a return movement for the next cycle, ports 50 and channels 51again coming into flow communication.

To start the motor, a compressed air connection with the main air source is provided to valve 67 disposed within cylinder lid 33 which opens into chamber 61. Compressed air may thereby be forced into chamber 61 to force piston 37 toward the forward end of the cylinder until control piston 58 touches the extension 68 in cylinder lid 34. Piston 58 is thereby displaced in the direction of arrow 63, so that disc valve 56 opens slightly. This allows compressed air from ports 50 to pass via chamber 51, chamber 52 and chamber 55 into chamber 57 whereby disc valve 56 is opened completely. The compressed air in chamber 57 then causes the movement of piston 37 in the direction of arrow 63.

A part of the exhaust air may be passed to chamber 71 anterior to lid 34 for cooling of the lid or mixed with oil vapors for lubrication of the sliding parts, such as housing 43, sleeve 42 and rails 21.

Motor 25 is flexibly mounted to plate 23 via buffer springs 72 and 73 and axially disposed tension screw 41. Screw 41 is inserted for resistance against torsion within block opening 74 of lid 40. Collar 75 on the anterior end of screw 41 serves to protect screw 41 and spring retaining nut 76 mounted thereon. Pin 77 secures collar 75 in place. Screw 78 further serves to secure lid 40 to lid 39.

What is claimed is:

1. A vibrator motor which comprises a cylinder chamber, a piston having a headend displaceable within said cylinder chamber, a counter chamber remote from said cylinder chamber capable of slidably receiving the end of said piston remote from said head end under pressure, means including a piston channel in said piston head end for passing intake air under compression into said cylinder chamber, control means including a pressure actuatable control piston valve disposed in said piston channel in the path of said intake air for controlling the intake air passing into said cylinder chamber and a loaded recoil valve disposed in said piston channel in the path of said intake air before said control piston valve, said control piston valve having a piston face in pressure communication with said counter chamber, and discharge means for passing exhaust air from said cylinder chamher. I

2. A vibrator motor according to claim 1 wherein said loaded valve is spring loaded against intake air.

3. A vibrator motor according to claim 1 wherein. said control piston valve includes a one-way disc valve .capable of being opened by compressed air in said cylinsaid counter chamber via a control piston cylinder chamher.

5. A vibrator motor according to claim 4 wherein said discharge means include discharge ports defined in'the sidewall of said cylinder chamber.

6. A vibrator motor according to claim 5 wherein said means for passing intake air into said cylinder chamber includeports defined in the sidewall of said cylinder chamber remote from said discharge ports.

7. A vibrator motor according to claim 5 wherein said discharge means includes means defining a path for chamber. a

' passing discharge air across the head of said cylinder" 8. A vibrator motor according to claim 1 wherein said motor is resiliently mounted via an extension means to a support frame. r v

9. A vibrator motor according to claim 8 wherein said extension means includes a tension. screw fixed to the head of said cylinder chamber longitudinally of the motor, coil springs disposed over said tension screw,

means for adjusting said springs on said tension screw, housing means disposed over said springs connected to said support frame, and sleeve means connected to the head of said cylinder and slidably enclosing said housing.

10. A vibrator motor according to claim 1 wherein said counter chamber is provided with a valve means for by a loaded valve means, channel means for passing intake air into said first chamber, said second chamber beinginterconnected by a disc valve means to said cylinder chamber, a control piston seated within the head end of said piston and connected at one end to said disc valve means, said control piston having a working face at its other end in pressure communication with said counter chamber, and discharge means for passing exhaust air from said cylinder chamber.

References Cited in the file of this patent UNITED STATES PATENTS 1,031,340 Howard July 2, 191 2 2,6l8;242 Hutchins Nov. 18, 1952 2,620,629 Gauldie Dec. 9, 1952 2,189,544 Dermond- ..-Apr. 23, 1957 2,851,013

Doughton Sept. 9, 1958