A heavy-duty stone screening machine

Abstract

The present invention relates to the technical field of stone screening machines, and provides a heavy-duty stone screening machine, which includes a frame, which includes a screening support frame and a driving support frame; a screening device, which includes a screening frame, a screen mesh and a swinging mechanism. The swinging mechanism includes a plurality of hanging rods. The screening frame is swingably arranged on the screening support frame through the hanging rods. Both ends of the hanging rods are rotatably connected to the screening frame and the screening support frame respectively; and a driving device, which is arranged on the driving support frame and includes a speed reducer, a rotation drive, a swinging rod and a rotating disc. The rotation drive is connected to the speed reducer, the rotating disc is arranged on the speed reducer, one end of the swinging rod is connected to the rotating disc, and the other end of the swinging rod is connected to the screening frame; the screening frame performs a reciprocating swinging motion under the drive of the driving device. Compared with the existing device that uses a vibration motor for vibration screening, the screening frame can swing in the horizontal and vertical directions, the material performs three-dimensional motion on the screen mesh, and the material is in full contact with the screen mesh, realizing more effective screening.

Description

Technical Field

[0001] The present invention relates to the technical field of stone screening machines, and provides a heavy-duty stone screening machine. Background Art

[0002] A stone screening machine is a device used for screening and sorting stones of different sizes and specifications, and is widely used in industries such as mines, building materials, chemical engineering, and cement. A heavy-duty stone screening machine refers to those with a larger processing capacity, a stronger vibration force, and a higher screening efficiency. Generally, it is used for screening larger and harder stones and is suitable for the preliminary screening and separation of large stones. Existing stone screening machines generally drive the screening mesh to vibrate through a vibration motor to achieve screening. Since heavy-duty stone screening machines are generally used to process larger materials, large-sized vibration motors are required, so that the vibration force of the vibration motor can overcome the self-weight of the stone screening machine, the material weight, and the friction force, enabling the stone screening machine to generate sufficient amplitude and frequency to achieve effective screening. Otherwise, the stable progress of screening cannot be guaranteed, and the specifications of the stone screening machine are restricted by the vibration motor. Therefore, for existing heavy-duty stone screening machines, their drive devices have large specifications, high energy consumption, and low screening efficiency, resulting in low production efficiency. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a heavy-duty stone screening machine to solve the problems in the prior art that the heavy-duty stone screening machine has high energy consumption, low screening efficiency, and low production efficiency.

[0004] One of the purposes of the present invention is achieved by adopting the following technical solution: A heavy-duty stone screening machine, characterized in that it includes

[0005] A frame, which includes a screening support frame and a drive support frame provided on one side of the screening support frame;

[0006] A screening device, which includes a screening frame, a screen mesh, and a swinging mechanism. The swinging mechanism includes a plurality of hanging rods. The screening frame is swingably provided on the screening support frame through the hanging rods. Both ends of the hanging rods are rotatably connected to the screening frame and the screening support frame respectively; and

[0007] A drive device, which is provided on the drive support frame and includes a reducer, a rotation drive, a swinging rod, and a rotating disk. The rotation drive is connected to the reducer. The rotating disk is provided on the reducer. One end of the swinging rod is connected to the rotating disk, and the other end of the swinging rod is connected to the screening frame; and

[0008] The screening frame performs a reciprocating swinging motion under the drive of the drive device.

[0009] Further, the rotating disk is vertically rotatably arranged on the speed reducer. The swing rod includes a straight rod, a connecting shaft on the rotating disk that is rotatably connected to the swing rod, and a driving connection seat on the screening frame that is rotatably connected to the other end of the swing rod.

[0010] Further, when the swing rod is in the vertically downward state, the connecting shaft is located at the leftmost or rightmost side of the rotating disk.

[0011] Further, when the swing rod is in the vertically downward state, the connecting shaft is located at the uppermost or lowermost side of the rotating disk.

[0012] Further, the rotating disk includes a fixed disk, a movable disk and an adjusting bolt. The fixed disk is fixedly arranged on the rotating disk. A plurality of corresponding bolt holes are provided on the fixed disk and the movable plate. The fixed disk and the movable disk are fixedly connected by a fixing bolt. The connecting shaft is arranged on the movable disk.

[0013] Further, the swing rod includes a first sleeve rod, a second sleeve rod and a limit bolt. The front end of the first sleeve rod is rotatably connected to the frame. The rear end of the second sleeve rod is rotatably matched with the connecting shaft. An insertion groove for the second sleeve rod to extend into is provided at the rear end of the first sleeve rod. A plurality of matching limit holes for the limit bolt to extend into are provided at the rear end of the first sleeve rod and the front end of the second sleeve rod.

[0014] Further, the swing rod further includes a random device one. The random device one includes an elastic member. The elastic member is arranged at the front end of the second sleeve rod. The second sleeve rod includes a main rod two and a fixing block two. The fixing block two is arranged at the front end of the main rod two. The elastic member is arranged between the fixing block two and the main rod two. The limit holes are arranged on the fixing block two.

[0015] Further, it further includes a random device two. The random device two includes a controllable telescopic rod. The controllable telescopic rod is arranged in the first sleeve rod. The first sleeve rod is in abutting and cooperating with the elastic member.

[0016] Further, transverse rods higher than the screening frame are provided at the front and rear ends of the screening support frame. The upper end of the hanging rod is rotatably arranged on the transverse rod. The lower end of the hanging rod is rotatably connected to the swing frame. A rotating connection frame is arranged on the swing frame.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention adopts a swing mechanism to drive the screening frame to perform a reciprocating swing motion, rather than using a vibration motor to drive the screening net to vibrate. Thereby, the influence of the self-weight of the stone screening machine, the weight of the material and the friction force on screening is reduced, the screening efficiency and stability are improved, at the same time, the energy consumption and noise are reduced, and the service life of the stone screening machine is prolonged. Brief Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the frame in some embodiments of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the screening device in some embodiments of the present invention;

[0022] Figure 4 It is Figure 3 The enlarged schematic diagram at A in;

[0023] Figure 5 It is a schematic diagram of the structure of the driving device;

[0024] Figure 6 It is a schematic diagram of the structure of the swing rod in some embodiments of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the random device 1 in some embodiments of the present invention

[0026] Figure 8 It is a schematic diagram of the structure of the random device 2 in some embodiments of the present invention

[0027] Figure 9 It is a schematic diagram of the structure of the rotating disk in some embodiments of the present invention.

[0028] In the figure:

[0029] 100 - frame,

[0030] 110 - screening support frame,

[0031] 120 - driving support frame,

[0032] 130 - vertical frame, 131 - first vertical frame, 1311 - first cross bar, 132 - second vertical frame, 1321 - second cross bar, 133 - third vertical frame,

[0033] 140 - connecting frame, 141 - side support frame, 142 - transverse support frame, 1421 - clearance groove,

[0034] Rotating connecting frame 1, 151 - fixing plate, 152 - vertical plate, 153 - rotating shaft,

[0035] 160 - rotating connecting frame 2,

[0036] 200 - screening frame, 201 - screen mesh, 210 - swing mechanism, 220 - hanging rod, 230 - rectangular pipe, 300 - driving device,

[0037] 310 - Reducer

[0038] 320 - Rotational drive

[0039] 330 - Swing rod, 331 - Sleeve rod one, 3311 - Insertion groove, 332 - Sleeve rod two, 3321 - Main rod two, 3322 - Fixed block two, 3323 - Protrusion one, 333 - Limit bolt, 334 - Limit hole

[0040] 340 - Rotating disc, 341 - Fixed disc, 342 - Movable disc, 343 - Adjusting bolt, 344 - Connecting shaft, 345 - Driving connection seat

[0041] 350 - Conveyor belt

[0042] 400 - Random device one, 410 - Elastic member

[0043] 500 - Random device two, 510 - Controllable telescopic rod, 520 - Buffer member Specific implementation manner

[0044] Next, in combination with the appended Figure 1 to the appended Figure 9 and the specific implementation manner, the present invention will be further described. It should be noted that, on the premise of no conflict, any combination can be formed among the following-described embodiments or technical features to form a new embodiment.

[0045] Such as Figures 1 - 9As shown, specifically, the frame 100 includes a screening support frame 110 and a driving support frame 120 provided on one side of the screening support frame 110; the frame 100 includes three vertical frames fixedly connected to each other by steel pipes and a plurality of connecting frames 140 for connecting the vertical frames. The three vertical frames are respectively the first vertical frame 131, the second vertical frame 132, and the third vertical frame 133 erected in sequence. The vertical frames are all portal steel pipe frames, and steel plates for increasing the supporting force can be added as needed. The connecting frames are divided into a side support frame 141 for connecting the first vertical frame 131 and the second vertical frame 132 and a transverse support frame 142 for connecting the second vertical frame 132 and the third vertical frame 133. The first vertical frame 131, the second vertical frame 132, and the side support frame 141 form a screening support frame 110 with a hollow middle. The second vertical frame 132, the third vertical frame 133, and the transverse support frame 142 form a driving support frame 120 for fixing the driving device 300. And transverse bars higher than the screening frame are provided at the front and rear ends of the screening support frame 110. Specifically, the uppermost parts of the first vertical frame 131 and the second vertical frame 132 are provided with a first cross bar 1311 and a second cross bar 1321 for connecting the screening device. The heights of the first cross bar 1311 and the second cross bar 1321 are higher than the height of the transverse support frame 142. The screening device is swingably arranged on the first cross bar 1311 and the second cross bar 1321. Such a setting facilitates the connection of the driving device 300 to the lower part of the screening device;

[0046] Specifically, as Figure 2 and Figure 3 shown, the screening device includes a screening frame 200, a screening mesh 201, and a swinging mechanism 210. As Figure 2 shown, in this embodiment, the screening frame 200 is a rectangular frame. The screening mesh 201 is arranged inside the screening frame 200. The swinging mechanism 210 includes a plurality of hanging rods 220. The hanging rods 220 are articulated bearing connecting rods, that is, joint bearings are provided at both ends of the straight rod. The screening frame 200 is swingably arranged on the screening support frame 110 through the hanging rods 220. The upper ends of the hanging rods 220 are rotatably connected to the first cross bar 1311 and the second cross bar 1321. As Figure 4As shown in the figure, a first rotating connection frame 150 is provided at a position near the end of the first cross bar 1311 and the second cross bar 1321. A second rotating connection frame 160 is provided below the corresponding position of the first rotating connection frame 150 on the screening frame 200. The first rotating connection frame 150 and the second rotating connection frame 160 have the same structure, including a fixed plate 151, two vertical plates 152 and a rotating shaft 153 provided between the vertical plates 152. The rotating shaft 153 is rotationally matched with the spherical plain bearing on the hanging rod 220. A rectangular tube 230 extending in the width direction of the screening frame 200 is provided below the rear end of the screening frame 200. The length of the rectangular tube 230 is longer than the width of the screening frame 200. Second rotating connection frames 160 are provided on the upper side surfaces of the two ends of the rectangular tube 230. The rotating connection frames are connected to the lower ends of the hanging rods 220. The upper ends of the hanging rods 220 extend upward to the second cross bar 1321. Corresponding first rotating connection frames 150 are provided on the second cross bar 1321. Second rotating connection frames 160 are provided at positions near the width edges on the front side surface of the front end of the screening frame 200. First rotating connection frames 150 connecting the same hanging rod 220 are provided on the first cross bar 1311. The first cross bar 1311 and the second cross bar 1321 have the same height, and the hanging rods 220 have the same length. Therefore, the rear end of the screening frame 200 is higher than the front end of the screening frame 200. There is a certain angle between the screening frame 200 and the horizontal plane, and the angle is generally 4-6 degrees. The screening frame 200 can swing at a certain angle with the upper end of the hanging rod 220 as the center, and the swing is achieved by the force applied by the driving device 300;

[0047] Specifically, such as Figure 1 and Figure 5As shown, the driving device 300 is arranged on the driving support frame 120 and includes a speed reducer 310, a rotational drive 320, a swing rod 330, and a rotating disk 340. The rotational drive 320 generally uses an electric motor. In this embodiment, the horizontal support frame 142 is arranged in two layers. The rotational drive 320 is arranged on the lower-layer horizontal support frame 142, and the upper-layer horizontal support frame 142 is at the same height as the screening frame 200. The speed reducer 310 is fixedly arranged on the upper-layer horizontal support frame 142. The speed reducer 310 and the rotational drive 320 are connected by a conveyor belt 350. There is a clearance groove 1421 on the upper-layer horizontal support frame 142 for the conveyor belt 350 to pass through. The rotating disk 340 is arranged on the speed reducer 310. One end of the swing rod 330 is connected to the rotating disk 340, and the other end of the swing rod 330 is connected to the screening frame 200. In this embodiment, the rotating disk 340 is vertically rotatably arranged on the speed reducer 310. The rotating disk 340 is generally a circular disk. The swing rod 330 includes a connecting rod, and joint bearings are arranged at both ends of the swing rod 330. A connecting shaft 344 for rotatably connecting with the swing rod 330 is arranged on the rotating disk 340, and the connecting shaft is arranged near the edge of the rotating disk 340. A driving connection seat 345 for rotatably connecting with the other end of the swing rod 330 is arranged on the screening frame 200. The rotation of the electric motor drives the rotation of the rotating disk 340, and the rotating disk 340 drives the swing rod 330 to move back and forth, thereby pushing the screening frame 200 to move back and forth in the front-rear direction. The screening frame 200 performs a reciprocating swinging motion under the drive of the driving device 300. During the forward and backward movement of the screening frame 200, it is simultaneously restricted by the hanging rod 220. Therefore, it will perform an arc-shaped reciprocating swinging motion with the upper end of the hanging rod 220 as the fulcrum. The material on the sieve mesh 201 will move forward and upward along with the screening frame 200. When the screening frame 200 moves backward, the material has no supporting force and slowly descends forward and downward under the action of gravity and inertia. During the descending process, it will come into contact with the sieve mesh 201 again. After encountering a suitable sieve mesh 201 hole, it will be screened out from the sieve mesh 201 hole, while the oversized material will continuously move forward until it moves out of the range of the sieve mesh 201.Compared with the existing screening devices, this device can complete the screening work. However, the existing screening devices are affected by the self-weight of the screening machine and the weight of the materials. The larger the specification of the screening machine, the more energy-consuming vibration motor is required. In this device, most of the weight of the screen 201 frame and the weight of the materials are borne and supported by the screening support frame 110 and the suspension rod 220. The driving force for its shaking comes from the horizontal force provided by the reducer 310. The driving force required for its swinging is much smaller than that for the vibrating movement. Therefore, this device consumes less energy than the existing screening devices. At the same time, this device makes the screening frame 200 perform a reciprocating swinging movement. The screening frame 200 not only moves in the up and down direction but also moves in the front and back direction, making the material movement more active. When driven by a vibration motor, the screen 201 only moves in a single up and down direction, and the material movement direction is limited. Therefore, the screening efficiency of this device is higher.

[0048] As a further description, during the swinging activity, the amplitude and frequency of the swing will affect the movement range of the material on the screen 201, thereby affecting the screening effect. This device can control the swinging path of the screening frame 200 by controlling the position of the swing rod 330. When the swing rod 330 is in the vertically downward state, the connecting shaft is at the leftmost or rightmost side of the rotating disk 340. When the connecting shaft is at the rightmost side of the rotating disk 340, the rotating disk 340 rotates clockwise. As the push rod moves forward, the screening frame 200 will first move forward quickly. At the same time, restricted by the swing rod 330, it will move upward synchronously until the rotating shaft rotates from the rightmost side to the leftmost side. At this time, the push rod moves to the leftmost side of the movement range, and the screening frame 200 moves in an arc. The material will follow the screening frame 200 and move in an arc. When the rotating disk 340 continues to rotate clockwise, the connecting shaft will drive the swing rod 330 to move backward, and the screening frame 200 will move backward. The support of the screening frame 200 under the material is lost, and the material will move forward and downward a short distance due to inertia. When the connecting shaft moves to the leftmost side, the swing rod 330 will return to the initial position and start a new cycle. The screening frame 200 will convey the material forward and upward in an arc for a certain distance and contact some of the materials that are falling. Some materials will fall through the screen 201, and some materials will still remain on the screen 201, waiting for the screening frame 200 to push them forward. The time for the material to jump up from the screen 201 and re-contact the screen 201 is the time for the rotating disk 340 to rotate half a circle. The amplitude of the front and back swing of the screening frame 200 is the distance from the leftmost side to the rightmost side of the connecting shaft.

[0049] In some other embodiments, when the swing rod 330 is in the vertically downward state, the connecting shaft is located at the uppermost or lowermost side of the rotating disk 340. When the connecting shaft is located at the lowermost side of the rotating disk 340 and the rotating disk 340 rotates clockwise, within the period when the connecting shaft moves from the lowermost side to the leftmost side, the push rod will move forward a distance about the radius of the rotating disk 340, and the push screening frame 200 will move forward rapidly first. At the same time, restricted by the swing rod 330, it will move upward synchronously, and the material will leap up rapidly. When the connecting shaft moves from the leftmost side to the uppermost side, the screening frame 200 will move backward, and some of the materials will fall off the sieve 201. When the connecting shaft moves from the uppermost side to the rightmost side, the screening frame 200 will continue to move backward and upward. Until the connecting shaft reaches the rightmost side, the hanging rod 220 will move to the maximum swing angle backward. At this time, some of the materials will leap backward and fall to touch the sieve 201. In this embodiment, when the rotating disk 340 rotates for a certain period, the screening frame 200 will reach the maximum height twice, that is, the material will have two chances to leap up and re-contact the sieve 201. However, the forward movement distance of the screening frame 200 is relatively short. This embodiment is more suitable for screening smaller materials. In the present invention, when the starting position of the connecting shaft is different, the movement distance and up-and-down frequency of the screening frame 200 will be different, which can adapt to materials with different requirements.

[0050] As a further optimization, as Figure 9 shown, the rotating disk 340 includes a fixed disk 341, a movable disk 342 and a fixing member. The rotating disk 340 includes a fixed disk 341, a movable disk 342 and an adjusting bolt 343. The fixed disk 341 is fixedly arranged on the rotating disk 340. A plurality of corresponding bolt holes are provided on the fixed disk 341 and the movable plate. The fixed disk 341 and the movable disk 342 are fixedly connected by fixing bolts. The connecting shaft is arranged on the movable disk 342. The movable disk 342 has disks with different bracket sizes. The distances between the connecting shafts and the centers of the circles on different movable disks are different. Since the swing distance of the screening frame 200 is controlled by the movement range size of the connecting shaft during rotation, the size of the rotating disk 340 of this device can be changed according to requirements. At the same time, when the position of the connecting shaft changes, swing rods 330 with different lengths are required. A plurality of swing rods 330 with different lengths can be prepared, or a telescopic swing rod 330 can be prepared.

[0051] As a specific description of the swing rod 330, as Figure 6As shown, the swing rod 330 includes a first sleeve rod 331, a second sleeve rod 332 and a limit bolt 333. A joint bushing is provided at the front end of the first sleeve rod 331 and is rotatably connected to the screening frame 200. A joint bushing is provided at the rear end of the second sleeve rod 332 and is rotatably matched with the connecting shaft. An insertion groove 3311 for the second sleeve rod 332 to extend into is provided at the rear end of the first sleeve rod 331. A plurality of matching limit holes 334 for the limit bolt 333 to extend into are provided at the rear end of the first sleeve rod 331 and the front end of the second sleeve rod 332. The limit holes 334 are arranged in an array along the length directions of the first sleeve rod 331 and the second sleeve rod 332. When it is necessary to adjust the length of the swing rod 330, the limit bolt 333 can be removed first, and then the second sleeve rod 332 is moved to a specified distance. After ensuring that the limit holes 334 on the first sleeve rod 331 and the second sleeve rod 332 correspond to each other, the limit bolt 333 is passed through the limit holes 334 for fixation.

[0052] As an optimization, as Figure 7As shown, in some embodiments, the swing rod 330 further includes a random device 400. The random device 400 includes an elastic member 410. The elastic member 410 is provided at the front end of the second sleeve rod 332. The second sleeve rod 332 includes a second main rod 3321 and a second fixing block 3322. The second fixing block 3322 is provided at the front end of the second main rod 3321. The elastic member 410 is provided between the second fixing block 3322 and the second main rod 3321. Generally, a spring is selected as the elastic member 410. The limiting hole 334 is provided on the second fixing block 3322. During use, the second fixing block 3322 and a part of the second main rod 3321 extend into the insertion groove 3311, and the second fixing block 3322 is fixed in the first sleeve rod 331 through the limiting bolt 333. When the rotating disc 340 rotates, the connecting shaft drives the second main rod 3321 to move forward. During the forward movement of the second main rod 3321, the second main rod 3321 will press the elastic member 410 forward. The elastic member 410 then applies the force to the second fixing block 3322. Since the second fixing block 3322 is fixed to the first sleeve rod 331, the first sleeve rod 331 is stressed and moves forward to push the screening frame 200. When the second main rod 3321 moves backward, there is a first protrusion 3323 on the second main rod 3321 that abuts against the end of the insertion hole groove, and the protrusion drives the second sleeve rod 332 to move backward. During the process of swinging the screening frame 200, since an elastic member 410 is added as a buffer during the force transmission process, during the forward and backward processes, the reaction force given by the screening frame 200 to the elastic member 410 is different each time. Therefore, each time the screening frame 200 changes its forward or backward path, the forward movement distance of the second main rod 3321 is different. Therefore, the swing amplitude of the screening frame 200 changes slightly each time. This change increases the randomness on the basis of ensuring the swing frequency and amplitude of the screening frame 200, making the movement of the material irregular each time it jumps or contacts the screen 201, and avoiding the regular movement of the material, such as always falling on the iron wire of the screen 201.

[0053] In some embodiments, such as Figure 8As shown, it further includes a second random device 500. The second random device 500 includes a controllable telescopic rod 510. The controllable telescopic rod 510 is arranged in the insertion groove 3311 of the first sleeve rod 331, and the controllable telescopic rod 510 is in abutting cooperation with the elastic member 410. There are various choices for the controllable telescopic rod 510, such as an electric cylinder telescopic rod and a hydraulic telescopic rod. A buffer member 520 is provided at the end of the controllable telescopic rod 510. Generally, a spring is selected for the buffer member 520, and a square block is provided on the spring. Different from only arranging the first random device 400, the second fixing block 3322 does not need to be fixed, but moves with the movement of the second main rod 3321. The second fixing block 3322 is in abutting cooperation with the square block. When screening, the controllable telescopic rod 510 continuously extends and contracts inside the first sleeve rod 331 at the same time. Each time the second main rod 3321 advances forward, the length of the controllable telescopic rod 510 is different, and the position where the second fixing block 3322 abuts against the square block is also different. This is equivalent to the length of the entire swing rod 330 being different each time, resulting in different swing distances and amplitudes of the screening frame 200 each time, thereby increasing the randomness of the movement of the material on the sieve mesh 201.

[0054] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A heavy-duty stone screening machine, characterized in that, it includes a frame, which includes a screening support frame and a driving support frame provided on one side of the screening support frame; and a screening device, which includes a screening frame, a screen mesh and a swinging mechanism. The screen mesh is arranged inside the screening frame. The swinging mechanism includes a plurality of hanging rods. The screening frame is swingably arranged on the screening support frame through the hanging rods. Both ends of the hanging rod are rotatably connected to the screening frame and the screening support frame respectively; and a driving device, which is arranged on the driving support frame and includes a reducer, a rotating drive, a swinging rod and a rotating disc. The rotating disc includes a fixed disc, a movable disc and an adjusting bolt. The fixed disc is fixedly arranged on the movable disc. A plurality of corresponding bolt holes are provided on the fixed disc and the movable disc. The fixed disc and the movable disc are fixedly connected through the adjusting bolt. The rotating drive is connected to the reducer. The rotating disc is vertically rotatably arranged on the reducer. One end of the swinging rod is connected to the rotating disc, and the other end of the swinging rod is connected to the screening frame. A connecting shaft for rotatably connecting with the swinging rod is arranged on the rotating disc. A driving connecting seat for rotatably connecting with the other end of the swinging rod is arranged on the screening frame. The connecting shaft is arranged on the movable disc; the swinging rod includes a first sleeve rod, a second sleeve rod, a limit bolt, a random device one and a random device two. The front end of the first sleeve rod is rotatably connected to the screening frame. The rear end of the second sleeve rod is rotationally matched with the connecting shaft. An insertion groove for the second sleeve rod to extend into is provided at the rear end of the first sleeve rod. A plurality of matching limit holes for the limit bolt to extend into are provided at the rear end of the first sleeve rod and the front end of the second sleeve rod; the random device one includes an elastic member, and the elastic member is arranged at the front end of the second sleeve rod. The second sleeve rod includes a main rod two and a fixing block two. The fixing block two is arranged at the front end of the main rod two. The elastic member is arranged between the fixing block two and the main rod two. The limit hole is arranged on the fixing block two; the random device two includes a controllable telescopic rod, and the controllable telescopic rod is arranged inside the first sleeve rod. The first sleeve rod is in abutting cooperation with the elastic member. The fixing block two moves along with the main rod two. The fixing block two is in abutting cooperation with the square block; the screening frame performs a reciprocating swinging motion under the drive of the driving device.

2. The heavy-duty stone screening machine according to claim 1, characterized in that, when the swinging rod is in the vertically downward state, the connecting shaft is located at the leftmost or rightmost side of the rotating disc.

3. The heavy-duty stone screening machine according to claim 1, characterized in that, when the swinging rod is in the vertically downward state, the connecting shaft is located at the uppermost or lowermost side of the rotating disc.

4. The heavy-duty stone screening machine according to claim 1, characterized in that, horizontal rods higher than the screening frame are provided at the front and rear ends of the screening support frame. Rotating connection frames one for rotatably connecting with the hanging rods are provided on the horizontal rods. The lower end of the hanging rod is rotatably connected to the screening frame. A rotating connection frame two is provided on the screening frame.

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