CN217615190U - Material accumulation type crushing and screening production line - Google Patents

Abstract

The utility model discloses a long-pending material formula breakage and screening production line, including first crushing and screening unit, second crushing and screening unit, third crushing and screening unit, first screening unit and second screening unit, parallel setting about first crushing and screening unit is with third crushing and screening unit, parallel setting about second crushing and screening unit and first screening unit are, and second crushing and screening unit is located the rear side the place ahead of first crushing and screening unit, first screening unit is located the rear side the place ahead of third crushing and screening unit, be equipped with first conveyer belt between first crushing and screening unit and the second crushing and screening unit, be equipped with the second conveyer belt between second crushing and screening unit and third crushing and screening unit, there is the third conveyer belt between third crushing and screening unit and first screening unit, be equipped with the fourth belt conveyer belt between first screening unit and the fifth crushing and screening unit, the utility model discloses a function of feed, sieve in advance, the coarse crushing, the broken bits in order, finely cut, screening, the transport.

Description

Material accumulation type crushing and screening production line

Technical Field

The utility model belongs to the technical field of the building stones is broken, especially, relate to a long-pending material formula is broken and screening production line.

Background

Hard stone material size difference piling up in exploiting and the broken scene to the grit, often need carry out breakage and screening to the material, a large amount of dusts and earth can be attached to the outward appearance moreover, and the screening degree of difficulty is big, and the hard stone material crushing equipment who uses commonly at present has: jaw crusher, impact crusher, combined crusher, cone crusher, impact crusher, hammer crusher, etc. the structure of these hard stone material crushing apparatus is relatively single, the production process of these hard stone material crushing production apparatus is coarse, the degree of automation is low, the quality and output of gravel production are uncontrollable, the production is unbalanced, the efficiency is low, the crushed stone material can not be circularly crushed and comprehensively screened in multiple levels, it is difficult to form and realize full-automatic crushing and screening production of a stone material from small to large, the quality and efficiency of crushing and screening are seriously influenced, and it is difficult to adapt to the requirement of processing operation in large hard stone material environment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a long-pending material formula is broken and screening production line, according to the utility model discloses a production line can realize the feed, sieve in advance, coarse crushing, well garrulous, finely divided, screening, the function of carrying, forms a building stones from big to small full-automatic broken and screening production line. In order to achieve the above purpose, the utility model adopts the following technical scheme:

according to an aspect of the utility model provides a long-pending material formula crushing and screening production line, crushing and screening production line include first crushing screening unit, second crushing screening unit, third crushing screening unit, first screening unit and second screening unit, first crushing screening unit is with third crushing screening unit and controls parallel setting, and second crushing screening unit and first screening unit are and control parallel setting, and second crushing screening unit is located the rear side the place ahead of first crushing screening unit, and it is provided with the vibration feed sieve to incline in front of the pan feeding mouth of first crushing screening unit, and the right-hand member export of this vibration feed sieve links up with the pan feeding mouth of first crushing screening unit, and first screening unit is located the rear side the place ahead of third crushing screening unit, first crushing screening unit has first screening delivery outlet and second screening delivery outlet, is provided with first conveyer belt below the first screening delivery outlet of first crushing screening unit, and the screening delivery outlet of second crushing screening unit are provided with the crushing delivery outlet of second crushing screening unit and the discharge gate of second crushing screening unit, and the screening outlet of second crushing screening unit is provided with the crushing delivery outlet between the discharge gate of the crushing screening belt of third crushing screening unit, the crushing screening unit, and the crushing screening outlet of second screening unit are provided with the discharge gate.

Above-mentioned scheme is further preferred, is provided with the buffering hopper below the discharge end of first conveyer belt, communicates respectively in the below of the lateral part discharge gate of buffering hopper and is provided with a plurality of hubbers, first crushing and screening unit is jaw crusher, third crushing and screening unit is two trans-crushers, second crushing and screening unit is by a plurality of jaw crusher group, and the bottom discharge gate below of every hubber sets up a jaw crusher group, is provided with the buffering conveyer belt in the below of every jaw crusher group, and the discharge end of this buffering conveyer belt links up with the pan feeding end of second conveyer belt.

According to the scheme, the jaw breaking receiving hopper is arranged at the upper end of the jaw crusher set, the material guide plate is arranged in the material collecting hopper, and the material guide plate is inclined downwards from the material collecting hopper to extend onto the jaw breaking receiving hopper.

Above-mentioned scheme is further preferred, is provided with the receiving hopper above the left end entry of vibratory feeding sieve the below of first crushing and screening unit is provided with the pan feeding area of second finished product conveyer belt, and the pan feeding area of this second finished product conveyer belt is located the pan feeding end below of first conveyer belt.

According to the scheme, the first screening unit is further optimized to be a two-layer vibrating screening machine, the material returning belt is arranged between the discharging end of the upper vibrating screen of the first screening unit and the second conveying belt, and the discharging end of each layer of vibrating screen below the upper layer is provided with the second finished product conveying belt respectively.

Preferably, the second screening unit comprises a platform ladder assembly and three layers of vibrating screening machines obliquely arranged on the platform ladder assembly, and third finished product conveying belts are respectively arranged at the discharge ends of the layers of vibrating screening machines; the three-layer vibrating screen machine comprises a vibrating box body, a motor, a first layer screen body, a second layer screen body and a third layer screen body, wherein the first layer screen body, the second layer screen body and the third layer screen body are obliquely arranged in the vibrating box body from top to bottom respectively, a front supporting plate and a rear supporting column are arranged on the outer walls of the two sides of the front end and the rear end of the vibrating box body respectively, a rubber spring is arranged at the lower end of the front supporting plate and the lower end of the rear supporting column respectively, the rubber spring is connected to a platform ladder assembly, a vibrator is arranged on the side wall of the middle part close to the vibrating box body, the motor is arranged on the outer side of the vibrator and fixed to the platform ladder assembly through a buffering support, and the output shaft of the motor is connected with the vibrator in a transmission mode.

According to the scheme, the lifting adjusting support column is arranged at the front end of the vibration box body and below the support plate, the lower end of the lifting adjusting support column is fixed on the platform ladder stand assembly, and the lower end of the front support plate is fixed at the top end of the lifting adjusting support column through the rubber spring.

According to the scheme, the material guide cylinder is arranged at the rear end of the vibrating box body, the bent material guide channels which are respectively communicated with the first layer of sieve body, the second layer of sieve body and the third layer of sieve body are separated in the material guide cylinder, the tail end outlet of each bent material guide channel is respectively provided with a material guide pipe, and the bottom end of each three layer of sieve body is provided with a material discharge hopper.

To sum up, because the utility model adopts the above technical scheme, the utility model discloses following technological effect has:

(1) The utility model discloses a crushing and screening production line can realize the feed, sieve in advance, coarse crushing, well garrulous, finely divided, screening, the function of carrying, forms a building stones from big to little full-automatic crushing and screening production line, can realize the building stones and tentatively sieve dregs, increase work efficiency, reduce the unnecessary breakage.

(2) The crushing and screening production line of the utility model can take unqualified aggregates after screening back to the impact crusher unit through the return materials to carry out circulating impact crushing, thereby realizing multi-circulating crushing and multi-level comprehensive screening, and the stones can realize full-motion finished product crushing, screening and conveying in the full production flow; and the material can be continuously and uniformly fed to the crusher in the process of crushing and screening the stone material, so that the blockage phenomenon in the crushing process of the crusher is avoided.

(3) When the stone is fed into the hopper, the stone accumulated in the hopper buffers the fed stone, the stone is in a material beating form, the stone is not directly abraded and impacts the hopper, and the stone is in a zero-abrasion accumulated material feeding form, so that unnecessary abrasion to the hopper is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of a material accumulation type crushing and screening production line of the present invention;

FIG. 2 is a schematic top view of the material accumulation type crushing and screening line of the present invention;

FIG. 3 is a schematic view of a second crushing and screening unit of the present invention;

FIG. 4 is a schematic view of the installation structure of the buffer hopper of the present invention;

figure 5 is a schematic diagram of a second screen assembly of the present invention;

FIG. 6 is a schematic structural view of the three-layer vibratory screening machine of the present invention;

FIG. 7 is a schematic cross-sectional view of a three-layer vibratory screening machine of the present invention;

in the drawings, a first crushing and screening unit 1, a second crushing and screening unit 2, a third crushing and screening unit 3, a first screening unit 4, a second screening unit 5, a second conveying belt 7, a third conveying belt 8, a fourth belt conveying belt 9, a vibratory feeding screen 10, a receiving hopper 11, a second finished product conveying belt 12, a jaw crushing unit 20, a buffer conveying belt 21, a jaw crushing hopper 22, a return belt 40, a second finished product conveying belt 41, a platform ladder assembly 50, a three-layer vibratory screening machine 51, a third finished product conveying belt 52, a buffer hopper 61, a discharge port 62, a material accumulating hopper 63, a material guide plate 64, a vibratory box body 510, a motor 511, a first layer screen body 512, a second layer screen body 513, a third layer screen body 514, a front support plate 515, a rear support column 516, a rubber spring 517, a lifting adjustment support column 518, a material guide cylinder 519, a bent material guide channel 520, a material guide pipe 521, a discharge hopper 522, a vibrator 5110 and a buffer support 5111.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

As shown in fig. 1 and 2, the material accumulation type crushing and screening production line according to the present invention comprises a first crushing and screening unit 1, a second crushing and screening unit 2, a third crushing and screening unit 3, a first screening unit 4 and a second screening unit 5, wherein the first crushing and screening unit 1 and the third crushing and screening unit 3 are arranged in parallel from left to right, the second crushing and screening unit 2 and the first screening unit 4 are arranged in parallel from left to right, the second crushing and screening unit 2 is located in front of the rear side of the first crushing and screening unit 1, a vibrating feeding screen 10 is obliquely arranged in front of the feeding port of the first crushing and screening unit 1, the right end outlet of the vibrating feeding screen 10 is connected with the feeding port of the first crushing and screening unit 1, the first screening unit 4 is located in front of the rear side of the third crushing and screening unit 3, first crushing and screening unit 1 has first screening delivery outlet and second screening delivery outlet, is provided with first conveyer belt 6 in first screening delivery outlet below of first crushing and screening unit 1, and the pan feeding end of this first conveyer belt 6 sets up in first screening delivery outlet below of first crushing and screening unit 1, the discharge end of first conveyer belt 6 is by first screening delivery outlet below slope upwards extending to the entry top of second crushing and screening unit 2, is provided with second conveyer belt 7 between the discharge gate of second crushing and screening unit 2 and the pan feeding mouth of third crushing and screening unit 3, is provided with third conveyer belt 8 between the discharge gate of third crushing and screening unit 3 and the pan feeding mouth of first screening unit 4, be provided with fourth belt conveyer belt 9 between the discharge gate of first screening unit 4 and fifth crushing and screening unit 5. The collected stones are fed to a vibration feeding sieve 10 above a first crushing and screening unit 1 through an excavator, a loader or an automatic unloading vehicle to be subjected to vibration preselection screening, silt and mud powder are conveyed to a specified position through powder sieved by the vibration feeding sieve 10, the mud powder in the stones is removed, the mud powder can be recycled and fully utilized, the stones sent by the vibration feeding sieve 10 are sent to the first crushing and screening unit 1 to be crushed and screened for the first time, the stones are crushed to 1050mm, and the stones which are crushed and screened for the first time are conveyed to a specified stone storage area through a first stone conveying belt 12; the rest stone materials are conveyed to a second crushing and screening unit 2 by a first conveying belt 6 to be subjected to material distribution treatment and then subjected to jaw crushing, the stone materials crushed by the second crushing and screening unit 2 are conveyed to a third crushing and screening unit 3 by a second conveying belt 7 to be subjected to impact crushing, so that automatic secondary crushing is realized, the crushed stone materials fall into a third conveying belt 8 after the secondary crushing is finished and are conveyed into a first screening unit 4 to be subjected to two-layer screening, stone materials with three particle sizes are screened out, unqualified aggregate (stone material with a first particle size) screened out by the first layer is returned to a material return belt 41 to be conveyed to the second crushing and screening unit 2 to be subjected to circular impact crushing; the stones (stones with the second grain diameter) with the size of 25-63 mm are screened out from the second layer and are conveyed to the designated position through a second finished product conveyor belt 40; discharging the rest stones (stones with the third grain size) to a fourth belt conveyer belt 9, conveying the stones to a second screening unit 5 through the fourth belt conveyer belt 9 for three-layer screening, screening stones with four grain sizes, and conveying the stones with the four grain sizes to a finished product area respectively.

In the utility model, a receiving hopper 11 is arranged above the left end inlet of a vibration feeding screen 10, a second finished product conveying belt 12 is arranged below the first crushing and screening unit 1, the feeding belt of the second finished product conveying belt 12 is positioned below the feeding end of the first conveying belt 6, a buffer hopper 61 is arranged below the discharging end of the first conveying belt 6, a plurality of material accumulating hoppers 63 are respectively arranged below the lateral discharging ports 62 of the buffer hopper 61 in a communicating manner, the first crushing and screening unit 1 is a jaw crusher, the third crushing and screening unit 3 is a double-reverse crusher, the second crushing and screening unit 2 is composed of a plurality of jaw crushing units 20, the utility model discloses four (table) jaw crushing units 20 are arranged to respectively collect stones sent out by the buffer hopper 61, a jaw crushing unit 20 is arranged below the bottom discharging port of each material accumulating hopper 62, a buffer conveying belt 21 is arranged below each jaw crushing unit 20, and the discharging end of the buffer conveying belt 21 is connected with the feeding end of the second conveying belt 7; a jaw breaking receiving hopper 22 is arranged at the upper end of the jaw crusher set 20, a material guide plate 64 is arranged in the material collecting hopper 63, and the material guide plate 64 extends downwards from the material collecting hopper 63 to the jaw breaking receiving hopper 22 in an inclined mode. The first screening unit 4 is a two-layer vibrating screening machine, a material returning belt 40 is arranged between the discharging end of the upper vibrating screen of the first screening unit 4 and the second conveying belt 7, and the discharging end of each layer of vibrating screen below the upper layer is respectively provided with a first finished product conveying belt 41; the collected stones are conveyed into a receiving hopper 11 to be buffered and slide down to a vibrating feeding screen 10 to be pre-screened in a vibrating mode, the stones falling from an outlet on the right side of the vibrating feeding screen 10 are conveyed into a first crushing and screening unit 1 to be primarily screened in a jaw mode, the stones falling through primary screening are conveyed to a finished product area through a first finished product conveying belt 41, the rest stones are conveyed to a feeding end of a first conveying belt 6 and conveyed into a buffer hopper 61 to be buffered, two discharging ports 62 are arranged on the side portion of the buffer hopper 61, the stones falling from the two discharging ports 62 on the side portion of the buffer hopper 61 are conveyed into a collecting hopper 63 on the corresponding side to be stacked, a material guide plate 64 in each collecting hopper 63 automatically slides down to be distributed and conveyed into two (platform) jaw crushing units 20 to be screened in a secondary jaw mode, the collecting hopper 63 adopts a pile self-weight sliding mode to be conveyed into a feeding hopper of the jaw crushing units 20, so that multi-layer sliding down is formed, abrasion is reduced, the aggregates fall, the aggregates crushed by each jaw crushing unit 20 fall into a second conveying belt 7 respectively, the aggregates are conveyed to be screened out through a third crushing unit 3 to be screened in a third crushing unit, the third crushing unit to be screened in a third crushing unit 8, and the aggregates with different particle sizes, and the aggregates to be automatically screened in a third crushing unit to be screened in a third crushing unit.

In the utility model, the second screening unit 5 comprises a platform ladder assembly 50 and three layers of vibrating screening machines 51 obliquely arranged on the platform ladder assembly, and the discharge ends of the vibrating screening machines 51 on each layer are respectively provided with a second finished product conveying belt 52; the three-layer vibration screening machine 51 comprises a vibration box body 510, a motor 511, a first layer of screen body 512, a second layer of screen body 513 and a third layer of screen body 514, wherein the first layer of screen body 512, the second layer of screen body 513 and the third layer of screen body 514 are obliquely arranged in the vibration box body 510 from top to bottom respectively, a front supporting plate 515 and a rear supporting column 516 are respectively arranged on the outer walls of the two sides of the front end and the rear end of the vibration box body 510, rubber springs 517 are respectively arranged at the lower ends of the front supporting plate 515 and the rear supporting column 516, the rubber springs 517 are connected on the platform ladder assembly 50, a vibrator 5110 is arranged on the side wall close to the middle part of the vibration box body 510, the motor 511 is arranged on the outer side of the vibrator 5110, the motor 511 is fixed on the platform ladder assembly 50 through a buffer bracket 5111, and the output shaft of the motor 511 is in transmission connection with the vibrator 5110; the front end of the vibration box body 510 is provided with a lifting adjusting support column 518 below the support plate 515, the lower end of the lifting adjusting support column 518 is fixed on the platform ladder assembly 50, the lower end of the front support plate 515 is fixed on the top end of the lifting adjusting support column 518 through a rubber spring 517, and the height of the lifting adjusting support column 518 is adjusted, so that the height of the feeding end of the vibration box body 510 is adjusted, and the inclination of the vibration box body 510 is changed. A material guide cylinder 519 is arranged at the rear end of the vibration box body 510, bent material guide channels 520 respectively communicated with the first layer of screen 512, the second layer of screen 513 and the third layer of screen 514 are separated in the material guide cylinder 519, a material guide pipe 521 is respectively arranged at the outlet of the tail end of each bent material guide channel 520, a material discharge hopper 522 is arranged at the bottom end of the three layer of screen 514, and 0-5 mm stone materials screened by the three layer of screen 514 are conveyed to a corresponding finished product area from the material discharge hopper 522; the motor 511 drives the vibrator to vibrate in the operation process, drives the vibration box 510 to vibrate back and forth on the rubber spring 517, and performs vibration screening on the stones conveyed by the fourth belt conveyor belt 9 on the first layer of screen 512, the first layer of screen 512 screens 20-25 mm stones, and stones larger than 25mm are discharged into the corresponding bent material guide channel from the surface vibration of the first layer of screen 512 and conveyed to the corresponding finished product area. When the motor 511 drives the vibrator 5110 to vibrate, the vibration box 510 is driven to vibrate back and forth in the horizontal direction, stone conveyed by the fourth belt conveyor 9 is firstly subjected to primary vibration screening by the first layer of screen 512 with the thickness of 20-25 mm in the vibration box 510, stone with the thickness of more than 25mm is sent out from the tail end discharge port of the first layer of screen 512 and slides out along the corresponding material guide cylinder 519, stone with the thickness of less than 20-25 mm falls to the second layer of screen 513 for screening, then 10-20 mm stone is screened by the second layer of screen 513, 5-10 mm stone and 0-5 mm stone are screened by the third layer of screen 514, 10-20 mm stone and 5-10 mm stone respectively slide down from the corresponding material guide pipes 521 at the tail end outlets of the bent material guide channels 520, and then are conveyed to the corresponding stone finished product areas for stacking. When the motor 511 drives the vibrator 5110 to vibrate, the vibration box 510 and the screen body inside the box are driven to vibrate together, and the three layers of screening hoppers distribute and guide the materials into each corresponding bent material guiding channel 520, slide down along the material guiding pipes 521 to the corresponding conveying belts, and convey the materials to the designated position for stacking.

The utility model discloses in, through utilizing the utility model relates to a long-pending material formula is broken and is carried out the screening process of broken building stones with screening production line according to following step: firstly, loading collected stones to a feeding vibrating screen 10 to feed the stones to the vibrating feeding screen 10 for pre-screening feeding, conveying screened powder to a specified position, sliding the rest stones from an outlet at the right end of the vibrating feeding screen 10 to a first crushing and screening unit 1 for primary crushing and primary crushing, finishing feeding, pre-screening and coarse crushing of the stones, forming aggregate with the size of more than 1050mm, and conveying the aggregate with the size of less than 1050mm out of the first crushing and screening unit 12; secondly, the aggregates obtained by primary vibration screening fall into a feeding end of a first conveying belt 6, the aggregates are conveyed to the upper part of a buffer hopper 61 through the first conveying belt 6 and fall into the buffer hopper 61, the aggregates obtained by primary screening are shunted by discharge holes 62 on the side part of the buffer hopper 61 and fall into a corresponding aggregate hopper 63, and the aggregates are buffered by a material guide plate 64 in the aggregate hopper 63 and fall into a corresponding jaw crusher set 20 for jaw crushing, so that automatic secondary crushing is realized, secondary blanking is obtained, crushing of the aggregates is completed, and stones with the size of more than 100mm are formed; stone materials are conveyed to a feeding end of the first conveying belt 6 and conveyed into a buffer hopper 61 to be collected, slide down by themselves after being stacked into a slope, uniformly slide into a material accumulating hopper 63 through a material outlet 62 on one corresponding side to be stacked to form secondary blanking, and are distributed to four jaw crushing units 20, wherein the material outlet 62 on each side is uniformly distributed to two jaw crushing units 20 to be subjected to jaw crushing, and the crushed blanking is uniformly gathered and conveyed to the next process; thirdly, finishing secondary crushing of the aggregates in the jaw crusher unit 20 to obtain secondary blanking, buffering the secondary blanking to fall into the feeding end of the second conveyer belt 7, conveying the secondary blanking into the third crushing and screening unit 3 for impact crushing, automatically realizing third crushing, obtaining tertiary blanking with smaller granularity, realizing the fine crushing process of the aggregates, enabling the particles of the aggregates to be not more than 63mm, and then uniformly conveying the tertiary blanking into the feeding end of the third conveyer belt 8 and conveying the tertiary blanking into the first screening unit 4 for two-layer screening; the unqualified aggregates after being screened are returned to the second conveyer belt 7 through the return belt 40 and are returned to the third crushing and screening unit 3 through the second conveyer belt 7 for circular crushing; finally, the first layer of stone materials which are obtained by screening of the first screening unit 4 and are 25-63 mm in thickness are conveyed to a specified position through a first finished product conveying belt 41; the residual stone materials are subjected to vibration screening and fall to the feeding end of a fourth belt conveyer belt 9 below the feeding end, the residual stone materials are conveyed to a three-layer vibration screening machine 51 of a second screening unit 5 by the fourth belt conveyer belt 9 to be subjected to three-layer screening, the residual stone materials are sequentially screened by the three-layer vibration screening machine 51 to obtain 20-25 mm stone materials, 10-20 mm stone materials, 5-10 mm stone materials and 0-5 mm stone materials, the stone materials which are screened at each layer are sequentially conveyed to a finished product stacking area from large to small, the grain sizes of the stone materials can be adjusted according to actual needs, and actual requirements of occasions on the grain sizes of various stone materials are met.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The utility model provides a long-pending material formula is broken and screening production line, broken and screening production line includes first broken screening unit, second broken screening unit, third broken screening unit, first screening unit and second screening unit, its characterized in that: first crushing and screening unit and third crushing and screening unit are left right side parallel arrangement, and second crushing and screening unit and first screening unit are left right side parallel arrangement, and second crushing and screening unit is located the rear side the place ahead of first crushing and screening unit, incline to be provided with the vibration feeding sieve before the pan feeding mouth of first crushing and screening unit, and the right-hand member export of this vibration feeding sieve links up with the pan feeding mouth of first crushing and screening unit, and first screening unit is located the rear side the place ahead of third crushing and screening unit, first crushing and screening unit has first screening delivery outlet and second screening delivery outlet, is provided with first conveyer belt below the first screening delivery outlet of first crushing and screening unit, and the pan feeding end of this first conveyer belt sets up in first screening delivery outlet below first crushing and screening unit, the discharge end of first conveyer belt is inclined by first screening delivery outlet below and upwards extends to the entry top of second crushing and screening unit, is provided with the second conveyer belt between the discharge gate of second crushing and the pan feeding mouth of third crushing and screening unit, is provided with the discharge gate of fourth screening unit between the discharge gate of third crushing and screening unit.

2. The accumulation type crushing and screening production line according to claim 1, wherein: a buffer hopper is arranged below the discharge end of the first conveyor belt, a plurality of material accumulation hoppers are respectively communicated and arranged below the discharge port at the side part of the buffer hopper, the first crushing and screening unit is a jaw crusher, the third crushing and screening unit is a double-reverse crusher, the second crushing and screening unit is composed of a plurality of jaw crusher units, one jaw crusher unit is arranged below a bottom end discharge port of each material accumulating hopper, a buffer conveying belt is arranged below each jaw crusher unit, and the discharge end of each buffer conveying belt is connected with the feed end of the second conveying belt.

3. The accumulation type crushing and screening production line of claim 2, wherein: the jaw crushing receiving hopper is arranged at the upper end of the jaw crusher set, the material guide plate is arranged in the material collecting hopper and extends downwards from the inner inclination of the material collecting hopper to the jaw crushing receiving hopper.

4. The accumulation type crushing and screening production line according to claim 2, wherein: a receiving hopper is arranged above an inlet at the left end of the vibratory feeding screen, a second finished product conveying belt is arranged below the first crushing and screening unit, and a feeding belt of the second finished product conveying belt is positioned below a feeding end of the first conveying belt.

5. The accumulation type crushing and screening production line of claim 2, wherein: the first screening unit is a two-layer vibrating screening machine, a material returning belt is arranged between the discharging end of the upper vibrating screen of the first screening unit and the second conveying belt, and the discharging end of each layer of vibrating screen below the upper layer is provided with the second finished product conveying belt respectively.

6. The accumulation type crushing and screening production line according to claim 1, wherein: the second screening unit comprises a platform ladder assembly and three layers of vibrating screening machines obliquely arranged on the platform ladder assembly, and a third finished product conveying belt is arranged at the discharge end of each layer of vibrating screening machine; the three-layer vibrating screen machine comprises a vibrating box body, a motor, a first layer screen body, a second layer screen body and a third layer screen body, wherein the first layer screen body, the second layer screen body and the third layer screen body are obliquely arranged in the vibrating box body from top to bottom respectively, a front supporting plate and a rear supporting column are arranged on the outer walls of the two sides of the front end and the rear end of the vibrating box body respectively, a rubber spring is arranged at the lower end of the front supporting plate and the lower end of the rear supporting column respectively, the rubber spring is connected to a platform ladder assembly, a vibrator is arranged on the side wall of the middle part close to the vibrating box body, the motor is arranged on the outer side of the vibrator and fixed to the platform ladder assembly through a buffering support, and the output shaft of the motor is connected with the vibrator in a transmission mode.

7. The accumulation type crushing and screening production line of claim 6, wherein: the front end of the vibration box body is provided with a lifting adjusting support column below the support plate, the lower end of the lifting adjusting support column is fixed on the platform ladder stand assembly, and the lower end of the front support plate is fixed on the top end of the lifting adjusting support column through a rubber spring.

8. The accumulation type crushing and screening production line according to claim 6, wherein: the rear end of the vibrating box body is provided with a material guide cylinder, bent material guide channels which are respectively communicated with the first layer of screen body, the second layer of screen body and the third layer of screen body are separated in the material guide cylinder, a material guide pipe is respectively arranged at the tail end outlet of each bent material guide channel, and a material discharge hopper is arranged at the bottom end of each three-layer screen body.

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