Limestone Crusher

Abstract

The present invention relates to the technical field of crushers, and specifically discloses a limestone crusher, including: a crusher body, a feed box, a crushing roller, an upper chamber and an intermediate chamber, a V-shaped screen plate fixedly installed on the feed box, the opening of the screen plate faces downward, small materials can fall from the screen plate, and large materials fall into the upper chamber, both ends of the screen plate are fixedly installed with bearing plates, the two bearing plates are inclined inward, and discharge plates are fixedly installed at the openings of the two bearing plates, the discharge plates are provided with discharge holes, and adjustment blocks are slidably fitted between the discharge plates and the bearing plates on both sides. The beneficial effects of the present invention are as follows: the rotating plate can be driven to rotate according to the amount of small materials, and the rotation of the rotating plate can drive the adjustment block to rise and fall, adjust the size of the crushing gap, control the crushing time of large materials, and can control the crushing time of large materials according to the amount of small materials, and can accelerate the rapid discharge of small materials in the intermediate chamber, achieve dynamic balance, and avoid clogging of the intermediate chamber.

Description

Technical Field

[0001] The invention relates to the technical field of crushers, in particular to a limestone crusher. Background Art

[0002] The crusher is a kind of equipment that crushes materials in the form of impact. It is divided into two types: single rotor and double rotor. It is a kind of crushing machine that directly crushes materials with a maximum particle size of 600-1800 mm to 25 or less. The hammer crusher is suitable for medium and fine crushing of materials with medium hardness, such as limestone, slag, coke, coal, etc. in cement, chemical, electric power, metallurgy and other industrial sectors.

[0003] The Chinese patent with the authorization announcement number CN209829122U discloses a double-rotor single-stage hammer crusher, including a frame, in which two relatively arranged rotors and a plurality of staggered turntables arranged on the two rotors are supported, each of the turntables is evenly provided with a plurality of hammers, and a plurality of buffer grate plates extending upward are fixedly provided on the crusher frame and between the gaps of the staggered wheel discs, and each two adjacent buffer grate plates cooperate and bend upward into the shape of a horn feed port, and the arc radius of each buffer grate plate is larger than the wheel disc radius but smaller than the throw-out radius of the hammer on the wheel disc. The patent document has an ingenious and concise structure, which greatly alleviates the impact force directly borne on the rotor and wheel disc of the crusher, prolongs the service life of the rotor and wheel disc, and reduces the replacement frequency.

[0004] In the production process of limestone, crushers are used to crush the raw materials. The existing crushers have defects. When the materials enter the crusher, the crushing process of large materials and small materials is basically the same, and the smaller particles cannot be crushed separately from the larger particles. This will cause the smaller materials to be over-crushed inside the crusher, making the excessive materials crushed smaller than the qualified particle size, or the powder particles caused by the crushing are too many, affecting the crushing effect. Summary of the invention

[0005] The present invention provides a limestone crusher, aiming to solve the technical problem that in the related art, a crusher is used to crush raw materials in the production process of limestone, and the existing crushers have defects. When the materials enter the crusher, the crushing process of large materials and small materials is basically the same, and the smaller particles cannot be crushed separately from the larger particles. This will cause the smaller materials to be over-crushed inside the crusher, so that the excessive crushed materials are smaller than the qualified particle size, or the powder particles caused by the crushing are large, which affects the crushing effect.

[0006] The limestone crusher of the present invention comprises: a crusher body, a feed box, a crushing roller, an upper chamber and an intermediate chamber. A V-shaped sieve plate is fixedly installed on the feed box, and the opening of the sieve plate faces downward, small materials can fall from the sieve plate, and large materials fall into the upper chamber. Both ends of the sieve plate are fixedly installed with bearing plates, and the two bearing plates are inclined inwardly. Discharging plates are fixedly installed at the openings of the two bearing plates, and the discharging plates are provided with discharge holes. Adjusting blocks are slidably matched between the discharging plates and the bearing plates on both sides, and a crushing gap is provided between the adjusting block and the crushing roller. Rotating plates are rotatably installed on the bearing plates, and one end of the rotating plate is rotatably matched with the adjusting block. Small materials can fall on the rotating plate, forcing the rotating plate to rotate, thereby driving the adjusting block to rise and fall. A baffle plate is slidably installed at the feed inlet of the feed box, and a driving assembly connected to the baffle plate is provided on the side wall of the feed box. The rotating plate has two relative motion positions. When moving to the first position, it can drive the adjusting block to rise and fall to adjust the size of the crushing gap. When the first position moves to the second position, the baffle plate can be driven to slide by the driving assembly.

[0007] Beneficial effects: the material falls on the screen plate first, the large material falls into the upper chamber from both sides, the small material enters the inner side of the supporting plate, and falls into the middle chamber below after the rotation of the auger. The small material will squeeze the rotating plate on the inner side of the supporting plate, forcing it to rotate. When there are more small materials, the rotating plate rotates, driving the adjusting block to descend, reducing the crushing gap, increasing the crushing time of large materials, and accelerating the rapid discharge of small materials in the middle chamber. The crushing time of large materials can be controlled according to the amount of small materials to achieve dynamic balance. When small materials are accumulated, after the rotation angle of the rotating plate reaches a certain threshold, as the rotating plate continues to rotate, the shielding plate can be driven through the driving component to block the feed port above the feed box, stop feeding, and avoid blockage of the middle chamber.

[0008] Preferably, the driving assembly includes an upper rack fixedly mounted on the shielding plate, a gear rotatably mounted on the side wall of the feed box, and a torsion spring is provided on the gear, and a lower rack meshing with the gear is also slidably mounted on the side wall of the feed box.

[0009] The effect is that after the rotation angle of the rotating plate reaches a threshold, continued rotation can drive the shielding plate to slide, thereby reducing the amount of feed added.

[0010] Preferably, a shell is installed on the feed box, a motor is installed in the shell, a plurality of augers are rotatably installed at the bottom of the shell, the plurality of augers are transmission-connected to each other, and the lower end of the augers extends into the discharge hole of the discharge plate.

[0011] The effect is that the auger can control the speed at which small materials are added into the middle cavity to ensure the uniform fall of the materials.

[0012] Preferably, the rotating plate is rotatably mounted on the supporting plate via a rotating shaft, and a torsion spring is provided on the rotating shaft. The rotating shaft divides the rotating plate into two parts, the extrusion part close to the bottom is the extrusion part, and the pushing part close to the top is the push part. The end of the extrusion part away from the rotating shaft is slidably matched with a retraction plate, a slide groove is provided on the inner side of the retraction plate, the extrusion part is slidably mounted in the slide groove, and the retraction plate is rotatably connected to the top of the adjustment block.

[0013] The effect is that small materials can be squeezed against the rotating plate, forcing it to rotate. The rotation of the rotating plate can drive the adjustment block to rise and fall, thereby adjusting the size of the crushing gap.

[0014] Preferably, the front and rear side walls of the rotating plate are slidably matched with the front and rear side walls of the feed box, and at the same time, the area of ​​the extrusion part is larger than the area of ​​the pushing part.

[0015] The effect is that the front and rear side walls of the rotating plate slide in cooperation with the front and rear side walls of the feed box to prevent small materials from leaking out of the front and rear gaps. The area of ​​the extrusion part is larger than the area of ​​the push part, so that the rotating shaft on the rotating plate is positioned closer to the top, ensuring that more materials can fall on the extrusion part.

[0016] Preferably, guide blocks are fixedly provided on the two opposite side walls of the upper opening of the feed box, a feed port is formed between the guide blocks, and two baffle plates are provided, which are slidably mounted on the guide blocks respectively.

[0017] Preferably, the upper chamber and the middle chamber are connected to each other, and the crushing gap is located at the connection point between the upper chamber and the middle chamber.

[0018] Preferably, the discharge plate is located directly above the middle cavity.

[0019] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: the screen plate can screen out smaller particles in the material, and the small materials fall onto the rotating plate in the material holding chamber. The rotating plate can be driven to rotate according to the amount of small materials. The rotation of the rotating plate can drive the adjusting block to rise and fall, adjust the size of the crushing gap, and control the crushing time of large materials. The crushing time of large materials can be controlled according to the amount of small materials, and the small materials in the middle cavity can be quickly discharged to achieve dynamic balance. When small materials are accumulated, after the rotation angle of the rotating plate reaches a certain threshold, as the rotating plate continues to rotate, the shielding plate can be driven by the driving component to block the feed port above the feed box, stop feeding, and avoid blockage of the middle cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereogram of the present invention.

[0021] Figure 2 It is a cross-sectional view of the present invention.

[0022] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0023] Figure 4 It is an axonometric cross-sectional view of the present invention.

[0024] Figure 5 It is a schematic structural diagram of the rotating plate of the present invention.

[0025] Figure 6 Schematic diagram of the drive assembly of the present invention.

[0026] Figure 7 It is a schematic diagram of the rotating plate of the present invention in a non-working state.

[0027] Reference numerals:

[0028] 10. Crusher body; 11. Feed box; 12. Crushing roller; 13. Upper chamber; 14. Middle chamber; 15. Dropping hole; 20. Guide block; 21. Shielding plate; 22. Upper rack; 23. Gear; 24. Lower rack; 30. Screen plate; 31. Loading plate; 32. Discharge plate; 33. Casing; 34. Auger; 40. Adjustment block; 41. Crushing gap; 51. Rotating plate; 52. Extrusion part; 53. Pushing part; 54. Retraction plate. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] like Figures 1 to 7 As shown, a specific embodiment of the limestone crusher of the present invention includes a crusher body 10, a crushing roller 12, a feed box 11, an upper chamber 13, an intermediate chamber 14, a screen plate 30, a bearing plate 31, a discharge plate 32, an auger 34, an adjustment block 40, a crushing gap 41, a rotating plate 51, a drive assembly and a baffle 21.

[0031] Two crushing rollers 12 are provided and rotatably installed in the crusher body 10. An upper chamber 13 is provided above the crushing rollers 12, and an intermediate chamber 14 is provided between the two crushing rollers 12. After being crushed in the upper chamber 13, large materials enter the intermediate chamber 14 and are crushed again before being discharged.

[0032] The feed box 11 is installed on the crusher body 10. A V-shaped screen plate 30 is arranged on the inner side of the feed box 11, and the angle is set downward. Support plates 31 are arranged at both ends of the screen plate 30. The two support plates 31 are arranged in an inverted eight-shaped shape. Discharge plates 32 are arranged at the openings at the lower ends of the two support plates 31. Multiple augers 34 are rotatably installed on the discharge plates 32. After the materials are screened by the screen plates 30, large materials fall into the upper chamber 13 from both sides, and small materials enter the inner side of the support plates 31. After the augers 34 rotate, they fall into the middle chamber 14 below and are discharged after being crushed.

[0033] There are gaps between the bearing plates 31 and the discharge plates 32 on both sides, and an adjusting block 40 is vertically slidably installed in the gap. There is a crushing gap 41 between the adjusting block 40 and the crushing roller 12. The adjusting block 40 can adjust the size of the crushing gap 41 by moving up and down, thereby controlling the crushing time of large materials in the upper chamber 13.

[0034] A rotating plate 51 is rotatably installed on the supporting plate 31. The lower end of the rotating plate 51 is rotatably matched with the adjusting block 40. Small materials fall on the rotating plate 51, so that the rotating plate 51 rotates to control the lifting of the adjusting block 40, so that the size of the crushing gap 41 can be controlled according to the amount of small materials inside the supporting plate 31. When there are many small materials, the rotating plate 51 drives the adjusting block 40 to descend, the crushing gap 41 is reduced, and the crushing time of large materials is increased, which can accelerate the rapid discharge of small materials in the middle cavity 14.

[0035] A baffle plate 21 is slidably installed at the opening above the feed box 11, and a driving assembly is also installed on the feed box 11. When the material is added too quickly or there are more materials with small particle sizes in the raw materials, small materials will accumulate. After the rotation angle of the rotating plate 51 reaches a certain threshold, as the rotating plate 51 continues to rotate, the driving assembly can be used to make the baffle plate 21 block the feed port above the feed box 11 to stop feeding.

[0036] During operation, the material is added into the crusher body 10 through the feed box 11, and the material first falls on the screen plate 30, and the large material falls into the upper chamber 13 from both sides, and the small material enters the inner side of the supporting plate 31, and falls into the lower middle chamber 14 after the rotation of the auger 34. The small material will squeeze the rotating plate 51 on the inner side of the supporting plate 31, forcing it to rotate. When there are many small materials, the rotating plate 51 rotates, driving the adjusting block 40 to descend, and the crushing gap 41 is reduced, thereby increasing the crushing time of the large material, which can accelerate the rapid discharge of the small material in the middle chamber 14, and can control the crushing time of the large material according to the amount of small material to achieve dynamic balance. When small materials are accumulated, after the rotation angle of the rotating plate 51 reaches a certain threshold, as the rotating plate 51 continues to rotate, the shielding plate 21 can be driven by the driving component to block the feed port above the feed box 11 to stop feeding.

[0037] like Figure 1 and Figure 2 Two crushing rollers 12 are rotatably installed inside the crusher body 10. The two crushing rollers 12 are arranged horizontally and spaced apart and driven by a motor. The rotation directions of the two are opposite. An upper chamber 13 is formed between the upper part of the crushing rollers 12 and the supporting plate 31 mentioned above. Large materials will fall into the upper chamber 13 for crushing. An intermediate chamber 14 is formed between the two crushing rollers 12. After the large materials are initially crushed in the upper chamber 13, they enter the intermediate chamber 14 and are crushed again by the crushing rollers 12 on both sides. A drop hole 15 is provided under the two crushing rollers 12, and the materials in the intermediate chamber 14 are discharged after passing through the drop hole 15.

[0038] like Figure 2 and Figure 4 Guide blocks 20 are fixedly provided on the two opposite side walls of the upper opening of the feed box 11, and a feed port is formed between the guide blocks 20. The upper end surfaces of the two guide blocks 20 are both inclined surfaces, and the inclined surfaces are inclined toward the feed port, which is convenient for adding materials into the crusher body 10.

[0039] The sieve plate 30 is arranged below the guide block 20, and the front and rear sides of the sieve plate 30 are fixed on the front and rear side walls of the feed box 11. The sieve plate 30 is V-shaped with the angle facing downward, and the angle at the top is located at the center of the feed port, so that after the material is added from the feed port, it can slide down along the two sides of the sieve plate 30, and small materials fall from the holes of the sieve plate 30, and large materials fall along the sieve plate 30 into the upper chambers 13 on both sides and directly begin to be crushed by the crushing rollers 12.

[0040] It is particularly noted that in the present invention, the material is crushed in the upper chamber 13 mainly by the hammer head on the crushing roller 12 contacting with the large material during the high-speed rotation, thereby crushing the large material to achieve the crushing effect. And the crushing principle belongs to the prior art and will not be elaborated here.

[0041] Both ends of the screen plate 30 are connected to inclined supporting plates 31 , the two supporting plates 31 are arranged in an inverted figure eight shape, the front and rear sides of the supporting plates 31 are fixedly mounted on the front and rear side walls of the feed box 11 , and the lower ends of the two supporting plates 31 have openings.

[0042] A discharge plate 32 is provided at the lower opening of the supporting plate 31. The front and rear sides of the discharge plate 32 are fixedly connected to the front and rear side walls of the feed box 11, and there are gaps between the two side surfaces of the discharge plate 32 and the supporting plates 31 on both sides thereof, and an adjustment block 40 is slidably fitted in the gap.

[0043] A material holding chamber is formed between the two carrying plates 31 , and small materials dropped from the screen plate 30 can fall into the material holding chamber.

[0044] like Figure 4A plurality of circular discharge holes are arranged at intervals on the discharge plate 32, a shell 33 is arranged in the material holding chamber, the shell 33 is fixedly mounted on the inner wall of the feed box 11, a motor (not shown in the figure) is installed in the shell 33, a plurality of augers 34 are rotatably mounted at the bottom of the shell 33, the plurality of augers 34 are transmission-connected, the motor can synchronously drive the plurality of augers 34 to rotate, the lower end of the augers 34 extends into the discharge hole of the discharge plate 32, so that when the augers 34 rotate, the small materials in the material holding chamber can be discharged, the discharge hole is directly opposite to the middle cavity 14, the small materials are directly discharged into the middle cavity 14, so that the small materials do not need to be crushed by the upper chamber 13, the small materials can be directly discharged after being crushed in the middle cavity 14, the crushing time of the small materials is reduced, and the excessive crushing of the small materials can be effectively avoided.

[0045] like Figure 2 and Figure 3 The upper chamber 13 and the middle chamber 14 corresponding to the upper and lower parts are connected to each other, so that the materials in the upper chamber 13 that have been preliminarily crushed can enter the middle chamber 14. The adjusting block 40 is located at the connection between the upper chamber 13 and the middle chamber 14. The gap between the adjusting block 40 and the crushing roller 12 is called the crushing gap 41. During the lifting and lowering process of the adjusting block 40, the size of the crushing gap 41 can be adjusted. That is to say, only materials smaller than the crushing gap 41 can enter the middle chamber 14 through the crushing gap 41.

[0046] Therefore, when the adjusting block 40 descends, the crushing gap 41 decreases, and large materials need to be crushed smaller in the upper chamber 13 before they can pass through the crushing gap 41 and enter the middle chamber 14, which can increase the crushing time of large materials in the upper chamber 13. At the same time, it can also accelerate the discharge of small materials from the material holding chamber and the middle chamber 14 to avoid material blockage in the middle chamber 14. On the contrary, when there is less material in the middle chamber 14, the torsion spring will drive the rotating plate 51 to rotate in the opposite direction, so that the adjusting block 40 rises, increasing the crushing gap 41, so that large materials can quickly enter the middle chamber 14 for crushing. The following will explain in detail how to adjust the lifting and lowering of the adjusting block 40 according to different situations.

[0047] Continue back Figure 4 and Figure 5 A rotating plate 51 is rotatably installed on the inner side surfaces of the two supporting plates 31. The rotating plate 51 is rotatably installed on the supporting plate 31 through a rotating shaft, and a torsion spring is arranged on the rotating shaft. The rotating shaft divides the rotating plate 51 into two parts, the extrusion part 52 is close to the bottom, and the pushing part 53 is close to the top. The end of the extrusion part 52 away from the rotating shaft is slidably matched with a contraction plate 54, and a slide groove is arranged on the inner side of the contraction plate 54. The extrusion part 52 is slidably installed in the slide groove, and the contraction plate 54 is rotatably connected to the top of the adjustment block 40.

[0048] It should be emphasized that the front and rear side walls of the rotating plate 51 and the shrinking plate 54 are slidably matched with the front and rear side walls of the feed box 11. At the same time, the area of ​​the extrusion part 52 is larger than the area of ​​the pushing part 53. That is to say, the position of the rotating shaft on the rotating plate 51 is close to one side of the pushing part 53, that is, close to the upper position.

[0049] As a result, the small materials entering the material holding chamber will be accumulated on the extrusion portion 52 and the contraction plate 54. According to the amount of the accumulated small materials, the rotating plate 51 can be squeezed to rotate, thereby causing the adjustment block 40 to rise and fall.

[0050] like Figure 7 In the non-working state, there is an angle between the rotating plate 51 and the supporting plate 31, that is, one side of the pushing portion 53 is close to the supporting plate 31, and one side of the extruding portion 52 is far away from the supporting plate 31. At this time, the adjusting block 40 is at the highest position, and the crushing gap 41 is also the largest.

[0051] After starting work, materials are added to the screen plate 30, large materials fall into the upper chamber 13 from both sides, and small materials enter the material holding chamber. Small materials will fall to the bottom of the material holding chamber, that is, small materials will accumulate on the extrusion part 52. When the amount of small materials is too large, the extrusion part 52 on the rotating plate 51 is subjected to a large force on one side, which will cause the rotating plate 51 to rotate, so that the rotating plate 51 drives the adjusting block 40 to descend. Since the adjusting block 40 moves vertically, the extrusion part 52 will shrink into the shrinking plate 54. When the adjusting block 40 descends, the crushing gap 41 will decrease, which increases the crushing time of large materials in the upper chamber 13. At the same time, it can also accelerate the discharge of small materials from the material holding chamber and the middle chamber 14 to avoid material blockage in the middle chamber 14.

[0052] It should be emphasized that when there is too much material in the middle cavity 14, the discharge speed of small materials in the material holding chamber will slow down, resulting in too much small material in the material holding chamber. Therefore, by adjusting the size of the crushing gap 41 and controlling the crushing time of large materials through the amount of small materials in the material holding chamber, the small materials in the middle cavity 14 can be quickly discharged to achieve dynamic balance.

[0053] When the material is added too quickly or there are more materials with small particle sizes in the raw materials, small materials will accumulate in the material holding chamber. At the same time, the material in the middle cavity 14 will also increase, which may cause blockage. Therefore, when the rotation angle of the rotating plate 51 reaches a certain threshold, it means that the amount of small materials in the material holding chamber is sufficient. If the amount of small materials continues to increase, it may cause blockage. The baffle plate 21 can block the feed port above the feed box 11 to stop feeding. How to achieve this will be described in detail below.

[0054] In this embodiment, the threshold value of the rotation angle of the rotating plate 51 is set to when the rotating plate 51 rotates to maintain a horizontal state with the supporting plate 31. At this time, the rotating plate 51 continues to rotate, and the shielding plate 21 can be driven by the driving component to move to block the material opening.

[0055] like Figure 2 and Figure 6 There are two groups of drive components, which are respectively arranged on the front and rear side walls of the feed box 11. The two drive components are respectively connected to the two baffle plates 21, so that the rotating plates 51 on both sides can respectively drive the baffle plates 21 on that side to close.

[0056] The driving assembly includes an upper rack 22 fixedly mounted on the baffle plate 21, a gear 23 rotatably mounted on the side wall of the feed box 11, and a torsion spring is provided on the gear 23 so that the gear 23 can automatically reset after rotation, and a lower rack 24 meshing with the gear 23 is also slidably mounted on the side wall of the feed box 11.

[0057] When the rotation angle of the rotating plate 51 reaches the threshold, that is, when the rotating plate 51 rotates to be horizontal with the supporting plate 31, the pushing portion 53 on the rotating plate 51 conflicts with the lower rack 24. If the amount of small materials in the material holding chamber continues to increase, as the rotating plate 51 rotates, the pushing portion 53 will push the lower rack 24 to move, thereby cooperating with the upper rack 22 through the gear 23 to drive the baffle plate 21 to gradually move toward the middle, and the feed port will gradually decrease, reducing the amount of material added until the feed port is completely closed and the feeding is stopped. After the blocked small materials are discharged, the rotating plate 51 gradually begins to rotate in the opposite direction, and the torsion spring on the gear 23 drives it to rotate in the opposite direction, so that the baffle plate 21 gradually opens.

[0058] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A limestone crusher, comprising: Crusher body, feed box, crushing roller, upper chamber and middle chamber; characterized in that a V-shaped screen plate is fixedly installed on the feed box, the opening of the screen plate faces downward, small materials can fall from the screen plate, and large materials fall into the upper chamber, both ends of the screen plate are fixedly installed with bearing plates, both bearing plates are inclined inward, and discharge plates are fixedly installed at the openings of the two bearing plates, with discharge holes, and adjustment blocks are slidably matched between the discharge plate and the bearing plates on both sides, and there is a crushing gap between the adjustment block and the crushing roller; A rotating plate is rotatably installed on the carrying plate, one end of the rotating plate is rotatably matched with the adjusting block, and small materials can fall on the rotating plate, forcing the rotating plate to rotate, thereby driving the adjusting block to rise and fall, and a shielding plate is slidably installed at the feeding port of the feeding box, and a driving component connected to the shielding plate is provided on the side wall of the feeding box; The rotating plate has two relative motion positions. When it moves to the first position, it can drive the adjustment block to rise and fall, and adjust the size of the crushing gap. When it moves from the first position to the second position, it can drive the shielding plate to slide through the driving component. The rotating plate is rotatably mounted on the supporting plate via a rotating shaft, and a torsion spring is arranged on the rotating shaft. The rotating shaft divides the rotating plate into two parts, the extrusion part close to the bottom is the extrusion part, and the pushing part close to the top is the push part. The end of the extrusion part away from the rotating shaft is slidably matched with a contraction plate, a slide groove is arranged on the inner side of the contraction plate, the extrusion part is slidably mounted in the slide groove, and the contraction plate is rotatably connected to the top of the adjustment block.

2. The limestone crusher according to claim 1, characterized in that: The driving assembly includes an upper rack fixedly mounted on the shielding plate, a gear rotatably mounted on the side wall of the feed box, and a torsion spring is arranged on the gear, and a lower rack meshing with the gear is also slidably mounted on the side wall of the feed box.

3. The limestone crusher according to claim 1, characterized in that: The feed box is provided with a shell, a motor is provided in the shell, a plurality of augers are rotatably provided at the bottom of the shell, the augers are transmission-connected to each other, and the lower end of the augers extends into the discharge hole of the discharge plate.

4. The limestone crusher according to claim 1, characterized in that: The front and rear side walls of the rotating plate are slidably matched with the front and rear side walls of the feed box, and at the same time, the area of ​​the extrusion part is larger than the area of ​​the pushing part.

5. The limestone crusher according to claim 1, characterized in that: Material guide blocks are fixedly arranged on the two opposite side walls of the upper opening of the feed box, and a feed port is formed between the material guide blocks. Two baffle plates are arranged and are slidably mounted on the material guide blocks respectively.

6. The limestone crusher according to claim 1, characterized in that: The upper chamber and the middle chamber are connected to each other, and the crushing gap is located at the connection point between the upper chamber and the middle chamber.

7. The limestone crusher according to any one of claims 1 to 6, characterized in that: The discharge plate is located directly above the middle cavity.

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