Quartz sand multilayer vibrating screen
By designing a multi-layer vibrating screening structure in the quartz sand screening equipment, including buffer material separation mechanism and bidirectional screening mechanism, the problems of particle accumulation material blockage and screening plate damage in traditional equipment are solved, and the screening efficiency and Particle size uniformity reduces energy consumption and extends equipment life.
Patent Information
- Application Number
- CN202420693050.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-07
AI Technical Summary
Traditional quartz sand screening equipment is prone to the problems of particle accumulation and damage to the screen plate during the screening process, resulting in low screening efficiency and large energy consumption, and long-term operation may lead to the screen plate breakage.
A quartz sand multi-layer vibrating screen was designed, using buffer material separation mechanism, bidirectional screening mechanism and unloading mechanism, and through buffer material separation plate, inverted V-shaped screen plate, unidirectional screen plate and vibrating conveying screen plate, etc. , evenly distribute and grade quartz sand to prevent impact from large particles, and quickly clean materials through belt conveyors to avoid accumulation and blockage.
It improves the efficiency and particle size uniformity of quartz sand screening, reduces the wear of the screen plate and the motor load, extends the service life of the equipment, and avoids the problems of low efficiency and high energy consumption caused by accumulation and blockage.
Smart Images
Figure CN222197768U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of quartz sand screening equipment, in particular to a quartz sand multi-layer vibrating screen. Background Art
[0002] Quartz sand is obtained by crushing quartz particles, and its specifications vary greatly. It needs to be screened when it is used to ensure that the specifications of the quartz sand are consistent. At present, when screening quartz sand, some larger quartz sand particles have poor screening effects and are easily accumulated on the screening plate, which adds a large vibration burden to the screen plate, affecting the screening effect and efficiency of the quartz sand. In addition, during the existing screen plate feeding process, large particles of quartz sand are easy to impact the screen plate, causing the screen plate to deform. After the screen plate is deformed, it is easy for material to accumulate on the screen plate, and it is also easy to block the material, resulting in high working pressure on the screen plate, increased motor load, and easy burning of the motor. At the same time, the diameter of the screen hole will also be enlarged, resulting in uneven particle size of the screened quartz sand. Long-term operation causes the screen plate to vibrate frequently and is easy to break. Utility Model Content
[0003] The present application provides a quartz sand multi-layer vibrating screen, which solves the problem that quartz sand particles are easy to accumulate and block materials and damage the screen plate during the screening process of the traditional vibrating screen, resulting in low screening efficiency of the screen plate and high screening energy consumption.
[0004] The present application provides a quartz sand multi-layer vibrating screen, comprising a base, a screening box is arranged above the base, the bottom of the screening box is elastically supported on the base by four groups of spring seats, a vibration motor is arranged in the middle position of the bottom of the screening box, a feed port is arranged at the top of the screening box, a feed pipe is arranged on the feed port, a buffer distribution mechanism is arranged at the top of the screening box, a two-way screening mechanism is arranged below the buffer distribution mechanism, a one-way screening mechanism is arranged below the two-way screening mechanism, a discharge mechanism is arranged below the one-way screening mechanism, and a belt conveyor is arranged below the discharge mechanism.
[0005] Furthermore, the buffer material distribution mechanism includes a buffer material distribution plate, a pivot shaft, a first electric push rod, and a first bearing seat. The buffer material distribution plate is horizontally arranged directly below the feed port. Two pivot shafts are symmetrically arranged on both sides of the buffer material distribution plate. One end of each pivot shaft is fixedly connected to the buffer material distribution plate, and the other end is rotatably connected and supported by a first bearing seat arranged at a corresponding position on the side wall of the screening box. A vertical first electric push rod is arranged at the bottom of the buffer material distribution plate, and the upper telescopic end of the first electric push rod is vertically hingedly connected to the first hinge seat arranged at the bottom of the buffer material distribution plate, and the lower fixed end of the first electric push rod is hingedly connected to the second hinge seat arranged on the side wall of the screening box.
[0006] Furthermore, the bidirectional screening mechanism includes a first screen plate, a force sensor, and a hinge. The two first screen plates are arranged in an inverted V-shaped structure below the buffer dividing plate. The two first screen plates are vertically pivotably connected by a hinge. The two ends of the central rotating shaft of the hinge are respectively fixedly connected to the two side walls of the screening box. Two first discharge ports are symmetrically arranged on the side walls of the screening box corresponding to the two first screen plates. A force sensor is arranged at the bottom of each first discharge port. The outer end portion of each first screen plate extends from the first discharge port to the outside of the screening box, and the bottom of each first screen plate is supported by the force sensor.
[0007] Furthermore, the one-way screening mechanism includes a second screen plate, a first mounting shaft, a first guide shaft, a first compression spring, a first air vibrator, a second electric push rod, and a first connecting rod. The second screen plate is tiltedly arranged in the screening box, and a second discharge port is arranged on the side wall of the screening box corresponding to the lower end of the second screen plate. The lower end portion of the second screen plate extends from the second discharge port to the outside of the screening box. A first guide shaft is vertically arranged in the middle position of the bottom of the second screen plate, a horizontal first mounting shaft is horizontally arranged below the second screen plate, a first guide hole is arranged in the middle of the first mounting shaft, and the first mounting shaft passes through In the first guide hole, two first compression springs are respectively mounted on the first guide shafts on both sides of the first mounting shaft, a first limit block is arranged at the lower end of the first guide shaft, two first air vibrators are arranged on both sides of the first mounting shaft at the bottom of the second screen plate, a horizontal first connecting rod is arranged on the first mounting shaft, one end of the first connecting rod is fixedly connected to the first mounting shaft, a vertical second electric push rod is arranged at the other end of the first connecting rod, the telescopic end of the upper end of the second electric push rod is hingedly connected to the first connecting rod, and the fixed end of the lower end of the second electric push rod is hingedly connected to the third hinge seat arranged on the side wall of the screening box.
[0008] Furthermore, the unloading mechanism includes a vibrating feed screen plate, a first vibrating motor, a cam, and a third compression spring. The vibrating feed screen plate is tilted below the second screen plate, and a third discharge port is arranged on the side wall of the screening box corresponding to the lower end of the vibrating feed screen plate. The lower end portion of the vibrating feed screen plate extends from the third discharge port to the outside of the screening box. A first vibrating motor is arranged at the bottom of the upper end of the vibrating feed screen plate, and the casing of the first vibrating motor is fixed to the inner wall of the screening box. A cam is fixed on the output shaft of the first vibrating motor, and the outer edge of the cam is against the bottom of the vibrating feed screen plate. A vertical third compression spring is arranged at the bottom of the lower end of the vibrating feed screen plate, and the upper end of the third compression spring is elastically connected and fixed to the bottom of the vibrating feed screen plate, and the lower end of the third compression spring is elastically connected and fixed to a fixed plate arranged at a corresponding position on the inner wall of the screening box.
[0009] Furthermore, a rubber layer is provided on the upper surface of the buffer distribution plate.
[0010] Furthermore, a fourth discharge port is arranged on the side wall of the screening box corresponding to the discharge end of the belt conveyor.
[0011] It can be seen from the above technical solutions that the present application provides a quartz sand multi-layer vibrating screen.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] The utility model evenly distributes the material to the bidirectional screening mechanism through the buffer distribution mechanism, so as to prevent large particles of quartz sand from directly causing impact on the screen plate, and performs bidirectional distribution according to the mass of quartz sand carried by the bidirectional screening mechanism, thereby increasing the screening efficiency. The quartz sand is further screened by the unidirectional screening mechanism and the unloading mechanism respectively, and the screening angle is adjustable. At the same time, the screening vibration position is reasonable, so as to prevent the material from staying on the screen plate for a long time to cause excessive wear on the screen plate, and can also effectively prevent the occurrence of material accumulation and blockage. The particle size after screening is uniform, and the screened material can be quickly cleaned up by the belt conveyor. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation cases. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0015] Figure 1 This is a schematic diagram of the overall structure of a quartz sand multi-layer vibrating screen proposed by the utility model;
[0016] Figure 2 This is a schematic cross-sectional view of the structure of a quartz sand multi-layer vibrating screen proposed by the utility model;
[0017] Figure 3 For the utility model Figure 2 A local enlarged schematic diagram of position Ⅰ;
[0018] Figure 4 This is a schematic diagram of the structure of a one-way screening mechanism of a quartz sand multi-layer vibrating screen proposed by the utility model;
[0019] Figure 5 The utility model is a partial structural schematic diagram of a quartz sand multi-layer vibrating screen.
[0020] In the figure:
[0021] 1-base; 11-spring seat; 12-vibration motor;
[0022] 2-screening box; 21-feeding port; 22-feeding pipe; 23-first discharge port; 24-second discharge port; 25-third discharge port; 26-fourth discharge port;
[0023] 3-buffer material distribution mechanism; 31-buffer material distribution plate; 32-pivot shaft; 33-first electric push rod; 34-first bearing seat; 311-rubber skin layer;
[0024] 4-bidirectional screening mechanism; 41-first screen plate; 42-force sensor; 43-hinge;
[0025] 5-one-way screening mechanism; 51-second screen plate; 52-first mounting shaft; 53-first guide shaft; 54-first compression spring; 55-first air vibrator; 56-second electric push rod; 57-first connecting rod; 521-first guide hole;
[0026] 6-discharging mechanism; 61-vibrating feeding screen plate; 62-first vibration motor; 63-cam; 64-third compression spring;
[0027] 7- Belt conveyor. DETAILED DESCRIPTION
[0028] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.
[0029] See also Figure 1-5 A quartz sand multi-layer vibrating screen comprises a base 1, a screening box 2 is arranged above the base 1, the bottom of the screening box 2 is elastically supported on the base 1 by four groups of spring seats 11, a vibration motor 12 is arranged at the middle position of the bottom of the screening box 2, a feed port 21 is arranged at the top of the screening box 2, a feed pipe 22 is arranged on the feed port 21, a buffer distribution mechanism 3 is arranged at the top of the screening box 2, a bidirectional screening mechanism 4 is arranged below the buffer distribution mechanism 3, a unidirectional screening mechanism 5 is arranged below the bidirectional screening mechanism 4, a discharge mechanism 6 is arranged below the unidirectional screening mechanism 5, and a belt conveyor 7 is arranged below the discharge mechanism 6.
[0030] In the above embodiment, the quartz sand is evenly distributed to the bidirectional screening mechanism 4 through the buffer distribution mechanism 3 to prevent large particles of quartz sand from directly impacting the screen plate, and bidirectional distribution is performed according to the mass of quartz sand carried by the bidirectional screening mechanism 4, thereby increasing the screening efficiency, and the quartz sand is further screened by the unidirectional screening mechanism 5 and the unloading mechanism 6. The screening angle is adjustable, and the screening vibration position is reasonable. The particle size after screening is uniform, and the screened material can be quickly cleaned by the belt conveyor 7.
[0031] In the above embodiments, see Figure 2 , 3The buffer material distribution mechanism 3 includes a buffer material distribution plate 31, a pivot shaft 32, a first electric push rod 33, and a first bearing seat 34. The buffer material distribution plate 31 is horizontally arranged directly below the feed port 21. Two pivot shafts 32 are symmetrically arranged on both sides of the buffer material distribution plate 31. One end of each pivot shaft 32 is fixedly connected to the buffer material distribution plate 31, and the other end is rotatably connected and supported by a first bearing seat 34 arranged at a corresponding position on the side wall of the screening box 2. A vertical first electric push rod 33 is arranged at the bottom of the buffer material distribution plate 31. The upper telescopic end of the first electric push rod 33 is vertically hingedly connected to the first hinge seat arranged at the bottom of the buffer material distribution plate 31, and the lower fixed end of the first electric push rod 33 is hingedly connected to the second hinge seat arranged on the side wall of the screening box 2.
[0032] In the above embodiments, see Figure 2 The bidirectional screening mechanism 4 includes a first screen plate 41, a force sensor 42, and a hinge 43. The two first screen plates 41 are arranged in an inverted V-shaped structure below the buffer dividing plate 31. The surface of the first screen plate 41 is processed with through holes in a matrix. The two first screen plates 41 are vertically pivotably connected by a hinge 43. The two ends of the central rotating shaft of the hinge 43 are respectively fixedly connected to the two side walls of the screening box 2. The side walls of the screening box 2 corresponding to the two first screen plates 41 are symmetrically provided with two first discharge ports 23. A force sensor 42 is arranged at the bottom of each first discharge port 23. The outer end portion of each first screen plate 41 extends from the first discharge port 23 to the outside of the screening box 2, and the bottom of each first screen plate 41 is supported by a force sensor 42.
[0033] In the above embodiments, see Figure 2 , 4The one-way screening mechanism 5 includes a second sieve plate 51, a first mounting shaft 52, a first guide shaft 53, a first compression spring 54, a first air vibrator 55, a second electric push rod 56, and a first connecting rod 57. The second sieve plate 51 is tiltedly arranged in the screening box 2. The surface of the second sieve plate 51 is processed with through holes in a matrix. The second discharge port 24 is arranged on the side wall of the screening box 2 corresponding to the lower end of the second sieve plate 51. The lower end of the second sieve plate 51 extends out of the second discharge port 24 to the outside of the screening box 2. The first guide shaft 53 is vertically arranged at the middle position of the bottom of the second sieve plate 51. The horizontal first mounting shaft 52 is horizontally arranged below the second sieve plate 51. The middle part of the first mounting shaft 52 is provided with a first guide hole 521. The first mounting shaft 52 is inserted into the first guide hole 521, and two first compression springs 54 are respectively sleeved on the first guide shafts 53 on both sides of the first mounting shaft 52. A first limit block is arranged at the lower end of the first guide shaft 53, and two first air vibrators 55 are arranged on both sides of the first mounting shaft 52 at the bottom of the second screen plate 51. A horizontal first connecting rod 57 is arranged on the first mounting shaft 52, and one end of the first connecting rod 57 is fixedly connected to the first mounting shaft 52, and a vertical second electric push rod 56 is arranged at the other end of the first connecting rod 57. The telescopic end of the upper end of the second electric push rod 56 is hingedly connected to the first connecting rod 57, and the fixed end of the lower end of the second electric push rod 56 is hingedly connected to the third hinge seat arranged on the side wall of the screening box 2.
[0034] In the above embodiments, see Figure 2 , 5 The unloading mechanism 6 includes a vibrating feeding screen plate 61, a first vibrating motor 62, a cam 63, and a third compression spring 64. The surface of the vibrating feeding screen plate 61 is processed with through holes in a matrix. The vibrating feeding screen plate 61 is tilted and arranged below the second screen plate 51. A third discharge port 25 is arranged on the side wall of the screening box 2 corresponding to the lower end of the vibrating feeding screen plate 61. The lower end portion of the vibrating feeding screen plate 61 extends out of the third discharge port 25 to the outside of the screening box 2. A first vibrating motor 62 is arranged at the bottom of the upper end of the vibrating feeding screen plate 61. The shell of the first vibrating motor 62 is fixed on the inner wall of the screening box 2. The cam 63 is fixed on the output shaft of the first vibrating motor 62. The outer edge of the cam 63 presses against the bottom of the vibrating feeding screen plate 61. A vertical third compression spring 64 is arranged at the bottom of the lower end of the vibrating feeding screen plate 61. The upper end of the third compression spring 64 is elastically connected and fixed to the bottom of the vibrating feeding screen plate 61, and the lower end of the third compression spring 64 is elastically connected and fixed to a fixing plate arranged at a corresponding position on the inner wall of the screening box 2.
[0035] In the above embodiment, the diameters of the sieve holes of the first sieve plate 41, the second sieve plate 51 and the vibrating feed sieve plate 61 are increased successively to achieve step-by-step screening.
[0036] In the above embodiment, preferably, a rubber layer 311 is provided on the upper surface of the buffer distribution plate 31, and its function is to provide a buffer for the large particles to prevent direct impact and damage to the screen plate.
[0037] In the above embodiments, see Figure 2 A fourth discharge port 26 is provided on the side wall of the screening box 2 corresponding to the discharge end of the belt conveyor 7 .
[0038] In the above embodiment, the vibration motor 12 is an existing commercially available product, and the vibration force is generated by the motor driving the eccentric block to rotate.
[0039] It can be seen from the above technical scheme that when in use, first start the vibration motor 12, and use the vibration force to act on the screening box 2, then add quartz sand from the feed pipe 22, the quartz sand first falls on the buffer distribution plate 31, and then the first electric push rod 33 drives its telescopic end to drive the buffer distribution plate 31 to tilt, and pour the material onto the first screen plate 41 on one side for screening. At the same time, after the force sensor 42 monitors the gravity change of the first screen plate 41, it feeds back the signal to the control system, and the control system controls the first electric push rod 33 to drive its telescopic end to drive the buffer distribution plate 31 to tilt in the other direction, and pours the material onto the first screen plate 41 on the other side for screening. According to the different screening residence time of the material on the screen plate, the buffer distribution plate 31 preferentially pours onto the first screen plate 41 on the side where the gravity is lighter. The material is prevented from being overloaded and causing excessive material accumulation or blockage on the two first sieve plates 41. The material on the first sieve plate 41 is discharged from the first discharge port 23, and the material under the sieve of the first sieve plate 41 falls on the second sieve plate 51, and the material on the sieve of the first sieve plate 41 is discharged from the second discharge port 24. The controller controls the two first air vibrators 55 to apply vibration force to the second sieve plate 51, and the undersieve of the second sieve plate 51 falls on the vibrating feed sieve plate 61, and the oversieve of the second sieve plate 51 is discharged from the third discharge port 25. The controller controls the first vibration motor 62 to drive the cam 63 to rotate, driving the vibrating feed sieve plate 61 to vibrate up and down, and the oversieve of the vibrating feed sieve plate 61 is discharged from the fourth discharge port 26, and the undersieve of the vibrating feed sieve plate 61 falls on the belt conveyor 7 and is discharged through the fourth discharge port 26.
[0040] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope of the present application is indicated by the claims.
[0041] It should be understood that the present application is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present application do not constitute a limitation on the scope of protection of the present application.
Claims
1. A quartz sand multilayer vibrating screen, characterized in that: The invention comprises a base (1), a screening box (2) is arranged above the base (1), the bottom of the screening box (2) is elastically supported on the base (1) by four groups of spring seats (11), a vibration motor (12) is arranged in the middle of the bottom of the screening box (2), a feed port (21) is arranged at the top of the screening box (2), a feed pipe (22) is arranged on the feed port (21), a buffer material distribution mechanism (3) is arranged at the top of the screening box (2), a bidirectional screening mechanism (4) is arranged below the buffer material distribution mechanism (3), a unidirectional screening mechanism (5) is arranged below the bidirectional screening mechanism (4), a discharge mechanism (6) is arranged below the unidirectional screening mechanism (5), and a belt conveyor (7) is arranged below the discharge mechanism (6).
2. A quartz sand multilayer vibrating screen according to claim 1, characterized in that: The buffer material distribution mechanism (3) comprises a buffer material distribution plate (31), a pivot shaft (32), a first electric push rod (33), and a first bearing seat (34). The buffer material distribution plate (31) is horizontally arranged directly below the feed port (21). Two pivot shafts (32) are symmetrically arranged on both sides of the buffer material distribution plate (31). One end of each pivot shaft (32) is fixedly connected to the buffer material distribution plate (31), and the other end is rotatably connected and supported by a first bearing seat (34) arranged at a corresponding position on the side wall of the screening box (2). A vertical first electric push rod (33) is arranged at the bottom of the buffer material distribution plate (31). The upper telescopic end of the first electric push rod (33) is vertically hingedly connected to a first hinge seat arranged at the bottom of the buffer material distribution plate (31), and the lower fixed end of the first electric push rod (33) is hingedly connected to a second hinge seat arranged on the side wall of the screening box (2).
3. The quartz sand multilayer vibrating screen according to claim 1, characterized in that: The bidirectional screening mechanism (4) comprises a first screen plate (41), a force sensor (42), and a hinge (43); the two first screen plates (41) are arranged below the buffering material distribution plate (31) in an inverted V-shaped structure; the two first screen plates (41) are vertically pivotably connected via a hinge (43); the two ends of a central rotating shaft of the hinge (43) are respectively fixedly connected to two side walls of the screening box (2); two first discharge ports (23) are symmetrically arranged on the side walls of the screening box (2) corresponding to the two first screen plates (41); a force sensor (42) is arranged at the bottom of each first discharge port (23); the outer end portion of each first screen plate (41) extends from the first discharge port (23) to the outside of the screening box (2); and the bottom of each first screen plate (41) is supported by the force sensor (42).
4. The quartz sand multilayer vibrating screen according to claim 1, characterized in that: The one-way screening mechanism (5) comprises a second screen plate (51), a first mounting shaft (52), a first guide shaft (53), a first compression spring (54), a first air vibrator (55), a second electric push rod (56), and a first connecting rod (57); the second screen plate (51) is obliquely arranged in the screening box (2); a second discharge port (24) is arranged on the side wall of the screening box (2) corresponding to the lower end of the second screen plate (51); the lower end of the second screen plate (51) extends out of the second discharge port (24) to the outside of the screening box (2); a first guide shaft (53) is vertically arranged at the middle position of the bottom of the second screen plate (51); a first horizontal mounting shaft (52) is transversely arranged below the second screen plate (51); a first guide hole (521) is arranged in the middle of the first mounting shaft (52); 2) is inserted into the first guide hole (521), two first compression springs (54) are respectively sleeved on the first guide shaft (53) on both sides of the first installation shaft (52), a first limit block is arranged at the lower end of the first guide shaft (53), two first air vibrators (55) are arranged on both sides of the first installation shaft (52) at the bottom of the second screen plate (51), a horizontal first connecting rod (57) is arranged on the first installation shaft (52), one end of the first connecting rod (57) is fixedly connected to the first installation shaft (52), and a vertical second electric push rod (56) is arranged at the other end of the first connecting rod (57), the upper telescopic end of the second electric push rod (56) is hingedly connected to the first connecting rod (57), and the lower fixed end of the second electric push rod (56) is hingedly connected to a third hinge seat arranged on the side wall of the screening box (2).
5. The quartz sand multilayer vibrating screen according to claim 1, characterized in that: The unloading mechanism (6) comprises a vibrating conveying screen plate (61), a first vibrating motor (62), a cam (63), and a third compression spring (64); the vibrating conveying screen plate (61) is arranged obliquely below the second screen plate (51); a third discharge port (25) is arranged on the side wall of the screening box (2) corresponding to the lower end of the vibrating conveying screen plate (61); the lower end portion of the vibrating conveying screen plate (61) extends from the third discharge port (25) to the outside of the screening box (2); the first vibrating motor (62) is arranged at the bottom of the upper end of the vibrating conveying screen plate (61); and the third compression spring (64) is arranged on the lower end of the vibrating conveying screen plate (61). A housing of a vibration motor (62) is fixed on the inner wall of the screening box (2); a cam (63) is fixed on the output shaft of the first vibration motor (62); the outer edge of the cam (63) presses against the bottom of the vibration feeding screen plate (61); a third compression spring (64) is vertically arranged at the bottom of the lower end of the vibration feeding screen plate (61); the upper end of the third compression spring (64) is elastically connected and fixed to the bottom of the vibration feeding screen plate (61); and the lower end of the third compression spring (64) is elastically connected and fixed to a fixing plate arranged at a corresponding position on the inner wall of the screening box (2).
6. The quartz sand multilayer vibrating screen according to claim 2, characterized in that: A rubber layer (311) is provided on the upper surface of the buffer distribution plate (31).
7. The quartz sand multilayer vibrating screen according to claim 1, characterized in that: A fourth discharge port (26) is provided on the side wall of the screening box (2) corresponding to the discharge end of the belt conveyor (7).