Conveyor belt catcher

Abstract

FIELD: conveyors.SUBSTANCE: device contains a rectangular frame fixed to the upper shelves of the supporting longitudinal beams of the conveyor at an acute angle to them in the direction of movement of the load branch of the belt. Two rotating pressure bars with mechanisms for their rotation are symmetrically fixed to the frame. A trolley is installed inside the frame, on which a single-acting belt support roller and two brake tables with working surfaces designed in such a way that a gap is maintained between them and the load branch of the belt during conveyor operation. The trolley is equipped with running wheels that can move longitudinally along guides located on the inside of the frame. Between the cross beam of the frame and the trolley on the side where the belt is running, coil springs are installed with mechanisms for adjusting the elastic forces of the springs acting on the trolley in the direction of belt movement. Each mechanism for rotating the pressure bars includes a system of levers with a ball joint and a cardan drive, which is activated by the movement of the trolley during the frictional interaction of the torn tape with the working surfaces of the brake tables and the shell of the single-acting roller.EFFECT: increased reliability and manufacturability of the conveyor belt catcher and eliminating frictional wear of the belt in the elements of the device.4 cl, 9 dwg

Description

[0001] The invention relates to safety devices for belt conveyors, namely to conveyor belt catchers, and can be used in the mining industry for catching the conveyor belt of inclined load-bearing conveyors in the event of its breakage.

[0002] A conveyor belt catcher is known, comprising two brake tables fixed at the edges of the conveyor frame, the working surface of which is adapted for sliding the load branch of the belt along it and is made with an inclination corresponding to the inclination of the adjacent side rollers of the conveyor roller supports, and rotary pressure bars fixed on the piston rods of pneumatic cylinders, the operation of which is carried out in response to a signal from belt break sensors [1] (prototype). A disadvantage of the known design is that it contains a complex and insufficiently reliable pneumatic-mechanical system "sensor - actuator". In addition, during conveyor operation, friction of the belt against the working surfaces of the brake tables occurs, resulting in its frictional wear.

[0003] The technical objective of the invention is to increase the reliability and manufacturability of the conveyor belt catcher, including eliminating the possibility of friction of the conveyor belt against the elements of the device during conveyor operation.

[0004] The stated task is achieved in that the conveyor belt catcher contains two brake tables on supports, the working surface of which is made with an inclination towards the center of the conveyor, corresponding to the inclination of the adjacent side rollers of the roller supports of the load branch of the belt, and two pressure bars with mechanisms for their rotation, while the device contains a rectangular frame formed by two longitudinal beams (9) and two transverse beams (10, 11), rigidly fixed on the supporting longitudinal beams (4) of the conveyor by means of support elements at an acute angle of convergence in the direction of movement of the load branch of the belt, the said longitudinal beams (9) of the frame and the plane of the upper shelves of the said supporting longitudinal beams (4) of the conveyor, fixed parallel and symmetrically to the longitudinal axis of the conveyor between the load and idle branches of the belt;a trolley is installed inside the frame, which contains two cross beams (14, 15), on which the supports of the brake tables are rigidly fixed, connecting the said cross beams (14, 15) of the trolley to each other, while running wheels are fixed on the cross beams (14, 15) of the trolley with the possibility of moving along guides located on the inner side of the longitudinal beams (9) of the frame; between the cross beam (10) of the frame and the cross beam (14) of the trolley on the side of the tape running up, coil springs are installed, with one end resting against stops fixed to the cross beam (14) of the trolley, and with the other end resting against stops of the mechanisms for adjusting the force of their compression, which are fixed to the cross beam (10) of the frame; the working surfaces of the said brake tables are arranged in such a way that during the operation of the conveyor, a gap of preferably 5...10 mm is maintained between them and the load branch of the belt.

[0005] A particular case of the design of the device is that each mechanism for turning the pressure bars includes a rod, one end of which is pivotally fixed to the end element of the cross beam (15) of the trolley, and the other end of which is pivotally connected to a double-arm lever, pivotally fixed to a fixed axis, which is fixed to a stand rigidly fixed to the longitudinal beam (9) of the frame perpendicular to the plane of the upper shelves of the said longitudinal support beams (4) of the conveyor, at the other end of the said double-arm lever a ball joint housing is fixed in which a ball head is placed, in which the end of the pin is fixed, the other end of which is pivotally fixed to an axis, horizontally fixed in the tail part of the drive shaft of the cardan transmission, fixed to the said stand perpendicular to the plane of the upper shelves of the said longitudinal support beams (4) of the conveyor with the possibility of rotation around its axis of rotation, wherein,the driven shaft of the said cardan transmission, located above, is also secured to the said stand perpendicular to the plane of the working surface of the corresponding brake table, and a pressure bar is rigidly secured to its free end, turned in the direction of movement of the belt parallel to the longitudinal axis of the conveyor with the possibility of turning toward the center of the conveyor around the axis of rotation of the said driven shaft of the cardan transmission at an angle of 90° when the trolley moves in the direction of the tape advance.

[0006] A special case of the design of the device is that a one-way rotating roller lined with friction material is installed on the cross beam (15) of the trolley, the top of the shell of which is located in the same plane as the top of the shell of the middle rollers of the adjacent roller supports of the conveyor.

[0007] A special case of the design of the device is that the working surfaces of the brake tables and pressure bars are lined with friction material.

[0008] The essence of the invention is explained by the drawings, where Fig. 1 shows a general view of a section of the conveyor with a rigid beam on which the proposed device is installed; Fig. 2 - a general view of a section of the conveyor with a rope beam on which the proposed device is installed; Fig. 3 - the proposed device (side view); Fig. 4 - view A in Fig. 3; Fig. 5 - view B in Fig. 3; Fig. 6 - section B-B in Fig. 3; Fig. 7 - section G-G in Fig. 3; Fig. 8 - remote element E in Fig. 3; Fig. 9 - trolley (top view). In Fig. 1 and 2, the arrow shows the direction of movement of the load branch of the belt. In Fig. 1, 2, 3, the symbol "a" designates the angle of convergence of the longitudinal beams of the frame and the plane of the upper shelves of the support longitudinal beams of the conveyor, fixed on the posts of the beam. In Fig. In Fig. 3, the symbol "Lx" denotes the trolley's travel when the belt breaks. In Fig. 3, the letter "D" denotes the mounting plane of the support portion of the device's support elements, which is in line with the plane of the upper shelves of the conveyor's longitudinal support beams.In Fig. 3, 7, 8, the protective covers of the rotation mechanisms of the rotary pressure bars are not shown conditionally.

[0009] The conveyor belt catcher 1 is installed between the load branch 2 of the belt and the idle branch 3 of the belt on the upper shelves of the support longitudinal beams 4 of the conveyor, fixed parallel and symmetrically to the conveyor axis between the load branch 2 of the belt and the idle branch 3 of the belt. In this case, in the case of installing the device on a conveyor with a rigid frame (Fig. 1), the longitudinal beams of the frame with flat shelves, on which the upper roller supports 5 are mounted, can be used as the support longitudinal beams 4 of the conveyor. In the case of installing the device on a conveyor with a rope frame and suspended upper roller supports 6 (Fig. 2), two longitudinal beams with flat shelves, rigidly fixed on additional posts 7, which are immovably fixed to the working floor, can be used as the support longitudinal beams 4 of the conveyor.

[0010] The device comprises a frame 8, which is made of a rectangular shape and includes two longitudinal beams 9, connected by cross beams 10 and 11, wherein the cross beam 10 is fixed on the oncoming side of the load branch 2 of the belt, and the cross beam 11 is fixed on the opposite side. The frame 8 is mounted on the supporting longitudinal beams 4 of the conveyor by means of supporting elements 12 with a flat support part at an acute angle α of convergence of the longitudinal beams 9 and the plane of the upper shelves of the supporting longitudinal beams 4 of the conveyor in the direction of movement of the load branch 2 of the belt. The preferred value of the angle α is in the range of 5°...10°.

[0011] Inside the frame 8 there is a trolley 13, which includes a cross beam 14, located on the advancing side of the load branch 2 of the belt, and a cross beam 15, located on the discharging side of the load branch 2 of the belt. Beams 14 and 15 are rigidly connected to each other by means of bolts by the supporting elements of two supports 16, which are installed perpendicular to the plane of the upper shelves of the longitudinal support beams 4 of the conveyor. In the upper part of the supports 16 there are fixed brake tables 17 of a rectangular shape with bevels on the advancing and discharging side of the load branch 2 of the belt, the working surface of which is made with an inclination towards the center of the conveyor, corresponding to the inclination of the side rollers of the adjacent roller supports 5 or 6 of the conveyor. The working surface of the brake tables 17 is lined with a friction material.The brake tables 17 are secured in such a way that when the conveyor is operating under conditions where the required belt tension is ensured, a gap of preferably 5...10 mm is maintained between their working surface and the load branch 2 of the belt. Running wheels 18 are secured to the cross beams 14 and 15 with the ability to move them together with the trolley 13 along guides located on the inner side of the longitudinal beams 9 of the frame 8, wherein, as an embodiment, the inner edges of the lower shelves of the channels from which the longitudinal beams 9 can be made can be used as such guides, as shown in Fig. 6. A single-rotation roller 19 lined with friction material is mounted on the cross beam 15, the top of the shell of which is located in the same plane with the top of the shell of the middle rollers of the upper adjacent roller supports 5 or 6. Free rotation of the roller 19 is carried out in the direction of movement of the load branch 2 of the belt.

[0012] Between the cross beam 10 and the cross beam 14, two coil springs 20 are installed with screw mechanisms 21 for adjusting the compression force of these springs. One end of the spring 20 rests against stops 22 secured to the cross beam 14, and the other end rests against stops 23 of the screw mechanisms 21 secured to the cross beam 10.

[0013] Each mechanism for rotating the clamping bars 24 includes a rod 25, one end of which is pivotally fixed by means of an axis on the end element 26 of the cross beam 15 of the bogie 13, and the other end of which is pivotally connected to a double-arm lever 27, pivotally fixed on a fixed axis 28, which is fixed on a stand 29, rigidly fixed on a longitudinal beam 9 of a frame 8 perpendicular to the plane of the location of the upper shelves of the supporting longitudinal beams 4. At the other end of the double-arm lever 27, a housing 30 of a ball joint is fixed in which a ball head 31 is placed, in which the end of a pin 32 is fixed, the other end of which is pivotally fixed on an axis 33, horizontally fixed in a slot in the tail part of the drive shaft 34 of the cardan transmission. The shaft 34 is mounted with the possibility of rotation around its axis of rotation in the sleeve 35, which is secured to the stand 29 using the support plate 36.The drive shaft 34 is connected by means of a cardan joint 37 to the driven shaft 38 located above, which is fixed with the possibility of rotation about its axis of rotation on the inclined plate 39 of the post 29 perpendicular to the plane of the working surface of the brake table 17. On the free end of the driven shaft 38, a rotary pressure bar 24 is rigidly fixed, deployed parallel to the longitudinal axis of the conveyor in the direction of movement of the load branch 2 of the belt with the possibility of rotation about the axis of the driven shaft 38 at an angle of 90° to the center of the conveyor in a plane parallel to the plane of the working surface of the brake table 17 when the trolley moves in the direction of the belt running in. The mechanisms for rotating the pressure bars 24 are covered by protective covers 40.

[0014] The conveyor belt catcher works as follows.

[0015] The device is rigidly fixed under the load branch 2 of the belt by means of support elements 12 on the supporting longitudinal beams 4 of the conveyor by means of bolted connections. This ensures a specified angle of convergence a of the longitudinal beams 9 of the frame 8 of the catcher and the supporting longitudinal beams 4 of the conveyor in the direction of movement of the load branch 2 of the belt. The compression force of the springs 20 is adjusted by means of screw mechanisms 21 so that, due to the elastic forces of the compressed springs 20, which act on the cross beam 14, the trolley 13 is moved along the guides as close as possible to the cross beam 11 of the frame 8, with an abutment against the stop bolts 41 fixed on the cross beam 11.

[0016] During the operation of the conveyor, the load branch 2 of the belt, due to its tension, passes through the device without touching the working surface of the brake tables 17, maintaining a gap of about 5...10 mm, while the central part of the load branch 2 of the belt rests on the roller 19, thereby helping to maintain this gap.

[0017] When the belt breaks, in the absence of its tension, the load branch 2 of the belt, under the action of its own weight and the weight of the load, slides down the inclined part of the conveyor, bending and contacting the working surface of the brake tables 17, as well as with the shell of the one-way rotation roller 19, the rotation of which is blocked when the load branch 2 of the belt moves downwards. In this case, friction forces arise between the load branch 2 of the belt and the working surfaces of the brake tables 17 and the roller shell 19 lined with friction material. As a result, the sliding load branch 2 of the belt pulls the trolley 13 behind it, which, overcoming the resistance of the springs 20, moves after the belt along the guides located on the inner side of the longitudinal beams 9 of the frame 8. With the above-described movement of the trolley 13, the distance of the working surface of the brake tables 17 from the plane of the upper shelves of the support longitudinal beams 4 increases and the clamping bars 24 rotate toward the center of the conveyor in the following order.The end element 26 of the cross beam 15, which moves together with the trolley 13, pushes the rod 25 pivotally fixed thereto, which rotates the double-arm lever 27 pivotally connected to the rod 25 around the axis 28. When the double-arm lever 27 rotates, the housing 30 with the ball head 31, in which the end of the pin 32 is fixed, rotates around the axis 28. In this case, the other end of the pin 32 rotates around the axis 33, simultaneously rotating this axis 33 together with the drive shaft 34 around its axis of rotation. By rotating in the sleeve 35 around its axis of rotation, the drive shaft 34, by means of the cardan joint 37, rotates the driven shaft 38 around its axis of rotation together with the pressure bar 24, which rotates at an angle of 90° to the center of the conveyor. As a result, the load branch 2 of the tape is clamped between the working surface of the rotary pressure bars 24 and the working surface of the brake tables 17.The lining of the working surfaces of the rotary pressure bars 24 and the brake tables 17 with friction material ensures reliable fixation without slipping of the load branch 2 of the torn tape in the device.

[0018] The proposed invention ensures increased reliability and manufacturability of the conveyor belt catcher, and eliminates frictional wear of the belt in the elements of the device.

[0019] The experimental-industrial prototype of the device was manufactured at the Soligorsk Institute of Resource Saving Problems with Experimental Production.

[0020] 1. Belt conveyors in the mining industry / V.A. Dyakov, L.G. Shakhmeyster, V.G. Dmitriev et al. M., Nedra, 1982. P. 129-130.

Claims

1. A conveyor belt catcher comprising two brake tables on supports, the working surface of which is made with an inclination towards the center of the conveyor, corresponding to the inclination of the adjacent side rollers of the roller supports of the load branch of the belt, and two pressure bars with mechanisms for their rotation, characterized in that the device also comprises a rectangular frame formed by two longitudinal beams (9) and two transverse beams (10, 11), rigidly fixed to the supporting longitudinal beams (4) of the conveyor by means of support elements at an acute angle of convergence in the direction of movement of the load branch of the belt, the said longitudinal beams (9) of the frame and the plane of the upper shelves of the said supporting longitudinal beams (4) of the conveyor, fixed parallel and symmetrically to the longitudinal axis of the conveyor between the load and idle branches of the belt;a trolley is installed inside the frame, which contains two cross beams (14, 15), on which the supports of the brake tables are rigidly fixed, connecting the said cross beams (14, 15) of the trolley to each other, while running wheels are fixed on the cross beams (14, 15) of the trolley with the possibility of moving along guides located on the inner side of the longitudinal beams (9) of the frame; between the cross beam (10) of the frame and the cross beam (14) of the trolley on the side of the tape running up, coil springs are installed, with one end resting against stops fixed to the cross beam (14) of the trolley, and with the other end resting against stops of the mechanisms for adjusting the force of their compression, which are fixed to the cross beam (10) of the frame; the working surfaces of the said brake tables are arranged in such a way that during the operation of the conveyor, a gap of preferably 5...10 mm is maintained between them and the load branch of the belt.

2. The conveyor belt catcher according to paragraph 1, characterized in that each mechanism for turning the pressure bars includes a rod, one end of which is pivotally fixed to the end element of the cross beam (15) of the trolley, and the other end of which is pivotally connected to a double-arm lever, pivotally fixed to a fixed axis, which is fixed to a post rigidly fixed to the longitudinal beam (9) of the frame perpendicular to the plane of the upper shelves of the said longitudinal support beams (4) of the conveyor, at the other end of the said double-arm lever a ball joint housing is fixed, in which a ball head is placed, in which the end of the pin is fixed, the other end of which is pivotally fixed to an axis, horizontally fixed in the tail section of the drive shaft of the cardan transmission, fixed to the said post perpendicular to the plane of the upper shelves of the said longitudinal support beams (4) of the conveyor with the possibility of rotation around its axis of rotation,wherein the driven shaft of the said cardan transmission, located above, is also secured to the said stand perpendicular to the plane of the working surface of the corresponding brake table, and a pressure bar is rigidly secured to its free end, turned in the direction of movement of the belt parallel to the longitudinal axis of the conveyor with the possibility of turning toward the center of the conveyor around the axis of rotation of the said driven shaft of the cardan transmission at an angle of 90° when the trolley moves in the direction of the tape advance.

3. A conveyor belt catcher according to paragraph 1, characterized in that a one-way rotating roller lined with friction material is installed on the cross beam (15) of the trolley, the top of the shell of which is located in the same plane as the top of the shell of the middle rollers of the adjacent roller supports of the conveyor.

4. A conveyor belt catcher according to paragraph 1, characterized in that the working surfaces of the brake tables and pressure bars are lined with friction material.

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