CN115364934B

CN115364934B - Stone crushing device

Info

Publication number: CN115364934B
Application number: CN202210922456.8A
Authority: CN
Inventors: 史小华; 梁星; 常春峰; 王雅静; 朱焕文; 唐华辉
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2023-05-23
Anticipated expiration: 2042-08-02
Also published as: CN115364934A

Abstract

The invention provides a stone crushing device which comprises a screening component, a transmission component, a main frame, an upper crushing component, a lower crushing component, a fixed roller component and a hydraulic cylinder, wherein the screening component is positioned at one end of the upper crushing component, which is close to the transmission component, an upper bottom plate of the upper crushing component is rotationally connected with the main frame through the hydraulic cylinder, the lower crushing component is positioned below the upper crushing component, a lower bottom plate of the lower crushing component is rotationally connected with an upper bottom plate of the upper crushing component, the lower crushing component is fixedly arranged on the main frame, and the fixed roller component is arranged at the output end of the transmission component. According to the crushing device, the screening assembly and the crushing assembly are arranged to realize step-by-step crushing, so that the problem of uneven granularity caused by feeding is solved, the double-movable roller and the fixed roller are combined, the distance between the double-movable roller and the fixed roller is adjusted through the hydraulic cylinder, the stone crushing efficiency is improved, and the whole crushing device adopts a modularized design, so that the follow-up disassembly and maintenance are convenient.

Description

Stone crushing device

Technical Field

The invention relates to the field of stone crushing, in particular to a stone crushing device.

Background

The sand stone and cement are used as basic materials with the largest dosage in the engineering construction process, often used as concrete raw materials to be widely applied to the fields of house construction and foundation construction, and are also important components of foundation beds of roads and railways. Along with the continuous expansion of the economic development scale of China, the demand of mineral resources is continuously increased, and the mineral quantity to be crushed is also rapidly increased. In national economic development, mineral processing plays an important role in the overall social development. According to the statistics of the related data, in all mineral processing in the world, the electric energy consumption in the whole ore dressing process is about 40% -60% for crushing and grinding, and the electric energy for crushing materials is about 15% of the total electric energy consumption, and the electric energy is increasing each year. With the increasing prominence of the world energy shortage problem, it is important to improve the energy utilization rate, and the development of efficient and energy-saving crushing equipment becomes a necessary choice.

In fact, crushers for fine grades in mountain stones, i.e. generally for 5-30mm of feed, less than 5mm of discharge, mainly have ball mills, twin roll crushers.

The main advantages and disadvantages of the current ball mill are as follows:

the advantages are that: 1. the crushing ratio is large, the operation is simple and convenient, and the fineness of the product is easy to adjust; 2. can work under different conditions, has strong adaptability, and can be produced by dry method and wet method; 3. the equipment is stable in operation and can continuously operate for a long time. Disadvantages: 1. the working efficiency is low, and the electric energy consumption is high; 2. the production cost is high, and the iron plate consumption is huge; 3. the configuration of the speed reducing device is too expensive; 4. the body is heavy, the transportation is inconvenient, and the disposable investment cost is high.

The advantages and disadvantages of the current twin roll crushers are as follows:

the advantages are that: 1. the occupied area is small, the volume is small, so that the transportation is more convenient, and the transportation cost is lower; 2. the dust generated during production is less, the noise is low, and the environmental pollution is low; 3. the roller of the counter roller crusher is made of high-wear-resistance materials, so that the wear resistance is high and the service life is longer; disadvantages: 1. the twin roller sand making machine belongs to small sand making equipment, and has lower production efficiency and low processing capacity; 2. the outer surface of the roller is easy to wear, so that the gap between the two rollers is large, the granularity of the product is uneven, and frequent repair is needed.

Therefore, how to solve the problems of low stone crushing production efficiency, high energy consumption, uneven granularity of stone finished products and the like in the prior art becomes an important technical problem to be solved by the technicians in the field.

Disclosure of Invention

According to the crushing device for stones, provided by the invention, the screening assembly and the crushing assembly are arranged, the stones are crushed step by step through the first crushing stage and the second crushing stage after being screened, the first crushing stage and the second crushing stage respectively correspond to the working stage of the upper driven roller and the working stage of the lower driven roller, the hydraulic cylinder is arranged to move the upper driven roller and the lower driven roller, so that the distance between the upper driven roller and the lower driven roller is changed, the stone crushing efficiency is improved, the whole structure adopts a modularized design, the maintenance is more convenient, the fixed rollers are driven by a single motor, and the energy loss is reduced.

The invention provides a stone crushing device which comprises a screening component, a transmission component, a main frame, an upper crushing component, a lower crushing component, a fixed roller component and a hydraulic cylinder, wherein the screening component is positioned at one end of the upper crushing component close to the transmission component, an upper bottom plate of the upper crushing component is rotationally connected with the main frame through the hydraulic cylinder, the lower crushing component is positioned below the upper crushing component, a lower bottom plate of the lower crushing component is rotationally connected with the upper bottom plate of the upper crushing component, the lower crushing component is fixedly arranged on the main frame, the fixed roller component is arranged at the output end of the transmission component, the transmission component comprises a motor, a motor seat, a first universal joint, a second universal joint, a third universal joint, a speed reducer seat and a coupling, an output shaft of the motor is fixedly arranged on the motor seat, a second end of the first universal joint is connected with a first end of the second universal joint, a second end of the second universal joint is fixedly connected with the first end of the second universal joint, the second end of the second universal joint is fixedly connected with the first end of the speed reducer, and the speed reducer is fixedly connected with the first end of the speed reducer seat; the utility model provides a crushing subassembly on, it includes upper plate, riser, upper hydraulic cylinder, goes up spring group, first spring holder, second spring holder, goes up slide rail, upper supporting arm, upper driven roller, upper bearing, bolster bearing housing and upper slider, the riser sets up perpendicularly on the upper plate, the first end setting of upper hydraulic cylinder is in the ear seat of riser and rather than rotating and being connected, the second end setting of upper hydraulic cylinder is in the ear seat of first spring holder bottom and rather than rotating and being connected, first spring holder pass through spring group with the second spring holder is connected, go up the slide rail symmetry and set up first spring holder both sides, just go up slide rail fixed mounting and be in on the upper plate, first spring holder and second spring holder bottom equal symmetry install the bolster bearing housing, first spring holder and second pass through the bolster with the sliding connection of upper slide rail realize reciprocating motion on the upper plate, the first end of upper supporting arm with the ear seat of second rotates to be connected, the second end of upper supporting arm rotates with the support arm respectively on the bearing housing rotates and is connected.

Further, screening subassembly, it includes feed inlet, screening case, screening frame and discharge gate, feed inlet fixed mounting is in screening case top, the screening case sets up in the screening frame, screening case bottom end opening part is equipped with the discharge gate.

Further, the lower crushing assembly comprises a lower bottom plate, a lower vertical plate, a lower hydraulic cylinder, a lower spring group, a third spring seat and a fourth spring seat, wherein the lower vertical plate is vertically arranged below the lower bottom plate, the first end of the lower hydraulic cylinder is arranged in the ear seat of the lower vertical plate and is rotationally connected with the ear seat, the second end of the lower hydraulic cylinder is arranged in the ear seat at the bottom end of the third spring seat and is rotationally connected with the ear seat, and the third spring seat is connected with the fourth spring seat through the lower spring group.

Further, the lower crushing assembly further comprises lower sliding rails, lower sliding blocks, lower supporting arms, lower driven rolls, lower bearings and lower bearing seats, the lower sliding rails are symmetrically arranged on two sides of the third spring seat, the lower sliding rails are fixedly arranged on the lower bottom plate, the lower sliding blocks are symmetrically arranged at the bottoms of the first spring seat and the second spring seat, the first spring seat and the second spring seat are connected with the lower sliding rails in a sliding mode through the lower sliding blocks, reciprocating movement on the lower bottom plate is achieved, the first ends of the lower supporting arms are connected with the lugs of the second spring seats in a rotating mode, the second ends of the lower supporting arms are connected with the lower bearing seats in a rotating mode, and two ends of the lower driven rolls are connected with the lower bearing seats in a rotating mode through the lower bearings respectively.

Preferably, the fixed roller assembly comprises a fixed roller, a bearing and a bearing seat, wherein two ends of the fixed roller are respectively and rotatably connected with the bearing seat through the bearing, and the bearing seat is fixedly arranged on the main frame.

Preferably, the output end of the coupler in the transmission assembly is connected with the fixed roller of the fixed roller assembly.

Preferably, the first universal joint, the second universal joint and the third universal joint in the transmission assembly are all connected through a cross shaft.

Compared with the prior art, the invention has the following characteristics:

1. the screening component in the crushing device solves the problem of uneven granularity caused by feeding, and the hydraulic cylinder is arranged to realize the movement of the upper driven roller and the lower driven roller, so that the distance between the upper driven roller and the fixed roller is changed, and the stone crushing efficiency is improved.

2. The crushing device is driven by a single motor, so that the problem of energy consumption is solved, meanwhile, a double-movable roller and single-fixed roller structure is adopted, the step-by-step crushing is realized, and in addition, the whole device adopts a modularized design, so that the problem of inconvenient maintenance and disassembly is solved.

3. According to the crushing device, the crushing assembly adopts the hydraulic cylinder and the spring set for mixed pressure, so that the pressure can be accurately provided, and the structure is simple and the reliability is high.

Drawings

FIG. 1 is an overall construction view of a stone crushing apparatus according to the present invention;

FIG. 2 is a block diagram of a screening assembly in the stone crushing apparatus of the present invention;

FIG. 3 is a block diagram of a transmission assembly in the stone breaker of the present invention;

FIG. 4 is a block diagram of an upper crushing assembly in the crushing apparatus of the stone material of the present invention;

FIG. 5 is a block diagram of a lower crushing assembly of the crushing apparatus of the stone material of the present invention;

fig. 6 is a block diagram of a fixed roller assembly and a main frame in the stone crushing apparatus of the present invention.

The main reference numerals:

screening module 1, feed inlet 11, screening box 12, screening frame 13, discharge outlet 14, transmission module 2, motor 21, motor mount 22, first universal joint 23, second universal joint 24, third universal joint 25, speed reducer 26, speed reducer mount 27, coupling 28, main frame 3, upper crushing module 4, upper bottom plate 41, upper riser 42, upper hydraulic cylinder 43, upper spring group 44, first spring seat 45, second spring seat 46, upper slide rail 47, upper support arm 48, upper driven roller 49, upper bearing 410, upper bearing seat 411, upper slider 412, lower crushing module 5, lower bottom plate 51, lower riser 52, lower hydraulic cylinder 53, lower spring group 54, third spring seat 55, fourth spring seat 56, lower slide rail 57, lower support arm 58, lower driven roller 59, lower bearing 510, lower bearing seat 511, lower slider 512, fixed roller module 6, fixed roller 61, bearing 62, bearing seat 63, hydraulic cylinder 7.

Detailed Description

In order to make the technical content, the structural features, the achieved objects and the effects of the present invention more detailed, the following description will be taken in conjunction with the accompanying drawings.

The crushing device of the invention is preferably used for crushing medium-fine stone, and can also be used for crushing stone of other grades according to the requirement. As shown in fig. 1, the stone crushing device comprises a screening component 1, a transmission component 2, a main frame 3, an upper crushing component 4, a lower crushing component 5, a fixed roller component 6 and a hydraulic cylinder 7, wherein the screening component 1 is positioned at one end of the upper crushing component 4, which is close to the transmission component 2, an upper bottom plate 41 of the upper crushing component 4 is rotationally connected with the main frame 3 through the hydraulic cylinder 7, the hydraulic cylinder 7 drives the upper crushing component 4 to rotate, so that the angle of the upper crushing component 4 is changed, the distance between an upper driven roller 49 and the fixed roller 61 is further adjusted, the lower crushing component 5 is positioned below the upper crushing component 4, a lower bottom plate 51 of the lower crushing component 5 is rotationally connected with the upper bottom plate 41 of the upper crushing component 4, the lower crushing component 5 is fixedly arranged on the main frame 3, and the fixed roller component 6 is arranged at the output end of the transmission component 2.

As shown in fig. 2, the screening assembly 1 comprises a feed inlet 11, a screening box 12, a screening frame 13 and a discharge outlet 14, wherein the feed inlet 11 is fixedly installed above the screening box 12, the screening box 12 is arranged on the screening frame 13, the screening box 12 adopts vibration screening to filter out unsatisfactory stones, the problem of uneven granularity of finished products caused by feeding is solved, excessive abrasion to rollers due to stone texture is avoided, and the discharge outlet 14 is arranged at the bottom end opening of the screening box 12.

As shown in fig. 3, the transmission assembly 2 includes a motor 21, a motor base 22, a first universal joint 23, a second universal joint 24, a third universal joint 25, a speed reducer 26, a speed reducer base 27 and a coupling 28, wherein the motor 21 is fixedly installed on the motor base 22, an output shaft of the motor 21 is connected with a first end of the first universal joint 23, a second end of the first universal joint 23 is connected with a first end of the second universal joint 24, a second end of the second universal joint 24 is connected with a first end of the third universal joint 25, a second end of the third universal joint 25 is connected with a first end of the speed reducer 26, and the first universal joint 23, the second universal joint 24 and the third universal joint 25 are all connected through cross shafts. The second end of the speed reducer 26 is connected with a coupler 28, the speed reducer 26 is fixedly arranged on a speed reducer base 27, and the output end of the coupler 28 in the transmission assembly 2 is connected with a fixed roller 61 of the fixed roller assembly 6.

As shown in fig. 4, the upper crushing assembly 4 includes an upper bottom plate 41, an upper vertical plate 42, an upper hydraulic cylinder 43, an upper spring group 44, a first spring seat 45, a second spring seat 46, an upper sliding rail 47, an upper supporting arm 48, an upper driven roller 49, an upper bearing 410, an upper bearing seat 411 and an upper sliding block 412, wherein the upper vertical plate 42 is vertically arranged on the upper bottom plate 41, a first end of the upper hydraulic cylinder 43 is arranged in an ear seat of the upper vertical plate 42 and is rotationally connected with the ear seat, a second end of the upper hydraulic cylinder 43 is arranged in the ear seat at the bottom end of the first spring seat 45 and is rotationally connected with the ear seat, the upper hydraulic cylinder 43 pushes the upper driven roller 49 to move through pushing the upper spring group 44, the first spring seat 45 is connected with the second spring seat 46 through the upper spring group 44, the crushing device is in the working process, the upper spring group 44 can avoid foreign matters, the foreign matters are prevented from entering between the two rollers to cause damage to the roller surface and generate larger impact, the upper sliding rail 47 is symmetrically arranged on two sides of the first spring seat 45, the upper sliding rail 47 is fixedly arranged on the upper bottom plate 41, the upper sliding seat 412 is symmetrically arranged at the bottom of the first 45 and the second spring seat 46, the upper sliding block 45 and the second spring seat 46 is rotationally connected with the upper sliding block 45, the upper sliding block 45 and the second spring seat 46 is rotationally connected with the upper bearing seat 46 through the upper bearing seat 49 and the upper bearing seat 48.

As shown in fig. 5, the lower crushing assembly 5 includes a lower bottom plate 51, a lower vertical plate 52, a lower hydraulic cylinder 53, a lower spring group 54, a third spring seat 55, a fourth spring seat 56, a lower slide rail 57, a lower supporting arm 58, a lower driven roller 59, a lower bearing 510, a lower bearing seat 511 and a lower slider 512, the lower vertical plate 52 is vertically disposed on the lower bottom plate 51, a first end of the lower hydraulic cylinder 53 is disposed in an ear seat of the lower vertical plate 52 and is rotationally connected with the ear seat of the lower vertical plate 52, a second end of the lower hydraulic cylinder 53 is disposed in the ear seat at the bottom end of the third spring seat 55 and is rotationally connected with the ear seat, the lower hydraulic cylinder 53 pushes the lower driven roller 59 to move by pushing the lower spring group 54, the third spring seat 55 is connected with the fourth spring seat 56 through the lower spring group 54, the lower spring group 54 can play a role of buffering protection, the lower slide rail 57 is symmetrically disposed at two sides of the third spring seat 55, the lower slide rail 57 is fixedly mounted on the lower bottom plate 51, the lower slider 512 is symmetrically mounted at the bottom of the third spring seat 55 and the fourth spring seat 56, the third spring seat 55 and the fourth spring seat 56 are rotationally connected with the lower spring seat 57 through the lower slider 512, the sliding connection of the lower slide rail 57, the upper spring seat 55 and the lower spring seat 55 are rotationally connected with the second end of the lower spring seat 55, the lower spring seat 59, the lower bearing seat 59 and the lower bearing seat 59 by the lower bearing seat 59, the support arm and the lower spring seat 59.

As shown in fig. 6, the fixed roller assembly 6 includes a fixed roller 61, a bearing 62 and a bearing housing 63, both ends of the fixed roller 61 are respectively rotatably connected with the bearing housing 63 through the bearing 62, and the bearing housing 63 is fixedly mounted on the main frame 3.

The following describes a crushing apparatus for medium-fine stone according to the present invention with reference to examples:

1. screening out stones meeting the crushing requirement

Stones enter the screening box 12 through the feed inlet 11 of screening subassembly 1, and screening box 12 filters out the stone that does not accord with broken shape and size through vibrating screen, and the stone that accords with broken shape and size exports through discharge gate 14, has solved the inhomogeneous problem of finished product granularity that produces because of the feed.

2. Pressure generation between driven and fixed rollers 61 (crushing unit 4 above is an example)

The working pressure between the upper driven roller 49 and the fixed roller 61 is provided by the upper spring group 44, the pressure of the upper spring group 44 is generated by the upper hydraulic cylinder 43, the pressure generated by the upper hydraulic cylinder 43 compresses the upper spring group 44, the pressure generated by the upper spring group 44 is conducted onto the upper driven roller 49 through the upper supporting arm 48, the upper sliding block 412 fixed on the upper bearing seat 411 enables the upper driven roller 49 to horizontally slide along the direction of the upper bottom plate 41 through the upper sliding rail 47, the upper driven roller 49 and the fixed roller 61 keep a reasonable distance, and the stability of the gap between the two rollers is ensured, so that the stable material layer thickness is generated.

3. Adjustment of the angle between the upper driven roller 49 and the fixed roller 61

The driving force of the angle adjustment between the upper driven roller 49 and the fixed roller 61 is derived from the hydraulic cylinder 7, two ends of the hydraulic cylinder 7 are respectively fixedly connected with the first ends of the upper bottom plate 41 and the lower bottom plate 51, the upper bottom plate 41 is fixedly connected with the second end of the lower bottom plate 51, and when the angle between the upper driven roller 49 and the fixed roller 61 needs to be adjusted, the angle is adjusted through the telescopic hydraulic cylinder 7, so that the crushing efficiency is effectively improved.

4. Power transmission of fixed roller 61

The driving force of the fixed roller 61 is derived from a motor 21 arranged in the transmission assembly 2, an output shaft of the motor 21 is fixedly connected with a first universal joint 23, the first universal joint 23 is fixedly connected with a second universal joint 24 through a cross shaft, the second universal joint 24 is fixedly connected with a third universal joint 25 through a cross shaft, the second end of the third universal joint 25 is fixedly connected with the input end of a speed reducer 26, the output end of the speed reducer 26 is fixedly connected with the input shaft of a coupler 28, the output shaft of the coupler 28 is fixedly connected with the input shaft of the fixed roller 61, the fixed roller 61 drives stones to move along with the roller surface through extrusion, the stones drive two driven rollers to rotate through friction force, the two driven rollers are in a follow-up state, and the two driven rollers are not driven. The motor 21 and the speed reducer 26 which are arranged in the transmission assembly 2 are fixedly connected through a universal joint, so that the transmission is stable, the efficiency is high, the gap impact is small, the transmission moment is large, and the larger crushing pressure of the roller wheel in the crushing process is ensured.

According to the stone crushing device, stone enters from the feed port 11 of the screening assembly 1, is screened by the screening box 12 arranged in the screening assembly 1, and the screening box 12 adopts vibration screening, so that the unsatisfactory stone diameter can be screened out in advance, in addition, the irregular stone is avoided, the problem of uneven granularity of finished products caused by feeding is solved, meanwhile, excessive abrasion of rollers due to stone texture is avoided, the screened stone enters between the fixed roller 61 and the upper driven roller 49 through the discharge port 14 of the screening assembly 1, and the materials begin to be crushed. The building stones have adopted two movable rollers, namely upper driven roller 49 and lower driven roller 59 and a fixed roller 61 structure in the broken in-process, two movable rollers (upper driven roller 49, lower driven roller 59) are distributed rationally, wherein two movable rollers (upper driven roller 49, lower driven roller 59) can carry out interval adjustment with fixed roller 61 according to the demand, and upper driven roller 49 can carry out the angle adjustment with fixed roller 61 through pneumatic cylinder 7, utilize the principle of broken step by step to reach the crushing requirement simultaneously, the operating pressure between two movable rollers (upper driven roller 49, lower driven roller 59) and the fixed roller 61 adopts compound pressure device, above crushing subassembly 4 is exemplified, can provide higher pressure to upper spring group 44 through last pneumatic cylinder 43, thereby make upper spring group 44 can dodge the foreign matter, prevent that the foreign matter from getting into between the two rollers and causing the damage and producing big impact, the building stones drive power of fixed roller 61 derives from the built-in motor 21 of drive assembly 2 in the broken in-process, the energy loss is lower, two movable rollers (upper driven roller 49, lower driven roller 59) do not have the drive, the reliability of the driven roller device has been greatly improved. In the later maintenance aspect, because the structure adopts the modularized design, the fixed roller 61 is arranged on the main frame 3, two movable rollers (the upper driven roller 49 and the lower driven roller 59) are also arranged on different bottom plates (the upper bottom plate 41 and the lower bottom plate 51), when one movable roller breaks down and needs to be maintained, the other movable roller can continuously work through the telescopic hydraulic cylinder (the upper hydraulic cylinder 43 and the lower hydraulic cylinder 53), the crushing efficiency of the movable roller is effectively improved, and meanwhile, the problem of inconvenience in maintenance and disassembly is also solved.

The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.

Claims

1. The utility model provides a breaker of building stones, its characterized in that includes screening subassembly, drive assembly, main frame, goes up crushing subassembly, lower crushing subassembly, fixed roll subassembly and pneumatic cylinder, screening subassembly is located go up the one end that crushing subassembly is close to drive assembly, go up the upper plate of crushing subassembly through the pneumatic cylinder with main frame rotates to be connected, lower crushing subassembly is located go up the below of crushing subassembly, lower plate of lower crushing subassembly with go up the upper plate of crushing subassembly rotates to be connected, lower crushing subassembly fixed mounting is in on the main frame, the output of drive assembly is equipped with fixed roll subassembly,

the transmission assembly comprises a motor, a motor seat, a first universal joint, a second universal joint, a third universal joint, a speed reducer seat and a coupler, wherein the motor is fixedly installed on the motor seat, an output shaft of the motor is connected with a first end of the first universal joint, a second end of the first universal joint is connected with a first end of the second universal joint, a second end of the second universal joint is connected with a first end of the third universal joint, a second end of the third universal joint is connected with a first end of the speed reducer, a second end of the speed reducer is connected with an input end of the coupler, and the speed reducer is fixedly installed on the speed reducer seat;

the utility model provides a crushing subassembly on, it includes upper plate, riser, upper hydraulic cylinder, goes up spring group, first spring holder, second spring holder, goes up slide rail, upper supporting arm, upper driven roller, upper bearing, bolster bearing housing and upper slider, the riser sets up perpendicularly on the upper plate, the first end setting of upper hydraulic cylinder is in the ear seat of riser and rather than rotating and being connected, the second end setting of upper hydraulic cylinder is in the ear seat of first spring holder bottom and rather than rotating and being connected, first spring holder pass through spring group with the second spring holder is connected, go up the slide rail symmetry and set up first spring holder both sides, just go up slide rail fixed mounting and be in on the upper plate, first spring holder and second spring holder bottom equal symmetry install the bolster bearing housing, first spring holder and second pass through the bolster with the sliding connection of upper slide rail realize reciprocating motion on the upper plate, the first end of upper supporting arm with the ear seat of second rotates to be connected, the second end of upper supporting arm rotates with the support arm respectively on the bearing housing rotates and is connected.

2. The stone crushing device of claim 1, wherein the screening assembly comprises a feed inlet, a screening box, a screening frame and a discharge outlet, the feed inlet is fixedly installed above the screening box, the screening box is arranged on the screening frame, and the discharge outlet is arranged at the opening at the bottom end of the screening box.

3. The stone breaker of claim 1, wherein the lower breaker assembly includes a lower plate, a lower riser, a lower hydraulic cylinder, a lower spring set, a third spring seat, and a fourth spring seat, the lower riser being disposed vertically below the lower plate, a first end of the lower hydraulic cylinder being disposed in and rotationally coupled to an ear mount of the lower riser, a second end of the lower hydraulic cylinder being disposed in and rotationally coupled to an ear mount of a bottom end of the third spring seat, the third spring seat being coupled to the fourth spring seat by the lower spring set.

4. The stone crushing device according to claim 1, wherein the lower crushing assembly further comprises a lower sliding rail, a lower sliding block, a lower supporting arm, a lower driven roller, a lower bearing and a lower bearing seat, the lower sliding rail is symmetrically arranged on two sides of the third spring seat, the lower sliding rail is fixedly arranged on the lower bottom plate, the lower sliding blocks are symmetrically arranged at the bottoms of the first spring seat and the second spring seat, the first spring seat and the second spring seat are connected with the lower sliding rail in a sliding manner, so that reciprocating movement on the lower bottom plate is realized, the first end of the lower supporting arm is rotationally connected with the lug seat of the second spring seat, the second end of the lower supporting arm is rotationally connected with the lower bearing seat, and two ends of the lower driven roller are rotationally connected with the lower bearing seat through the lower bearing respectively.

5. The stone crushing device according to claim 1, wherein the fixed roller assembly comprises a fixed roller, bearings and bearing blocks, both ends of the fixed roller are respectively and rotatably connected with the bearing blocks through bearings, and the bearing blocks are fixedly mounted on the main frame.

6. A stone breaker according to claim 1 or 5, characterised in that the output of the coupling in the transmission assembly is connected to the fixed roller of the fixed roller assembly.

7. The stone breaker of claim 1 wherein the first, second and third joints of the drive assembly are all connected by a cross.