Differential twin roll feed crusher

Abstract

This utility model relates to the field of feed processing machinery technology, specifically a differential speed double-roller feed crusher, which solves the problems mentioned in the background art. It includes a frame, a first and second roll arranged parallel to each other within the frame, and an adjustment mechanism for adjusting the roll gap between the first and second rolls. The frame also has a pair of second bearing seats that can move radially along the rolls. The two ends of the second roll are supported in the second bearing seats by bearings. A spring buffer device is provided between the second bearing seats and the frame. In this utility model, when an unbreakable hard object passes between the two rolls, the enormous impact force overcomes the preload of the pressure spring, pushing the second bearing seats and the second rolls backward together, instantly widening the roll gap and allowing the hard object to pass through. This avoids equipment jamming, roll damage, or transmission system damage, providing excellent overload protection.

Description

Technical Field

[0001] This utility model relates to the field of feed processing machinery technology, specifically a differential double-roller feed crusher. Background Technology

[0002] Double-roll crushers are commonly used crushing equipment in feed processing. They crush materials by squeezing and shearing them through two counter-rotating rolls. Differential-speed double-roll crushers, due to the speed difference between their two rolls, generate stronger shearing forces, resulting in higher crushing efficiency and better performance.

[0003] Existing differential double-roll crushers typically have one fixed roll and a movable roll, with the gap between the two rolls (roller pitch) adjusted by a mechanism to accommodate different crushing particle size requirements. A common adjustment mechanism uses a lead screw to directly push the movable roll's bearing housing. However, in actual operation, when uncrushable hard objects (such as iron blocks or stones) pass between the two rolls, a huge impact force is generated. If the rolls are rigidly fixed, this can easily lead to surface damage, jamming, or even damage to transmission components or the motor. Furthermore, traditional manual adjustment mechanisms require adjusting the lead screws on both sides separately, making it difficult to ensure complete synchronization of the roll pitch at both ends. This can result in uneven roll gaps, affecting crushing quality and accelerating roll wear.

[0004] Therefore, there is an urgent need for a differential double-roller feed crusher that can conveniently and accurately adjust the roller gap, has overload protection function, and can ensure synchronous adjustment at both ends. Utility Model Content

[0005] To solve the above problems, this utility model provides the following technical solution: a differential speed double-roll feed crusher, comprising a frame, a first roll and a second roll arranged parallel to each other within the frame, and an adjustment mechanism for adjusting the roll gap between the first roll and the second roll.

[0006] A pair of first bearing seats are fixedly installed on the frame, and the two ends of the first roll are supported in the first bearing seats by bearings.

[0007] The frame is also provided with a pair of second bearing seats that can move radially along the rolls, and the two ends of the second rolls are supported in the second bearing seats by bearings;

[0008] The adjustment mechanism includes two adjusting screws, each of which is threaded into the frame and its end abuts against a second bearing seat;

[0009] A spring buffer device is provided between the second bearing housing and the frame;

[0010] The spring buffer device includes a guide rod, a pressure spring, and a locking nut. One end of the guide rod is fixedly connected to or movably abuts against the second bearing seat, and the other end passes through a through hole opened on the frame. The pressure spring is sleeved on the guide rod and pre-compressed between the second bearing seat and the frame. The locking nut is threadedly connected to the end of the guide rod located on the outside of the frame.

[0011] Furthermore, the pressure spring is a disc spring assembly.

[0012] Furthermore, a thrust bearing is installed between the end of the adjusting screw and the contact surface of the second bearing seat.

[0013] Furthermore, the bottom or side of the second bearing housing is provided with a limiting protrusion, and the frame is provided with a guide groove that cooperates with the limiting protrusion. The second bearing housing is slidably connected to the frame through the cooperation of the limiting protrusion and the guide groove.

[0014] Furthermore, the adjustment mechanism also includes a linkage shaft and a bevel gear pair, with a driven bevel gear installed at the end of each of the two adjustment screws; the linkage shaft is rotatably supported on the frame, and each end of it is equipped with a driving bevel gear that meshes with the driven bevel gear.

[0015] Furthermore, the end of the guide rod connected to the second bearing seat is provided with a retaining ring to prevent it from dislodging from the second bearing seat.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] During normal operation, the pre-compressed pressure spring provides sufficient elasticity to keep the second roll in the set working position. When an uncrushable hard object passes between the two rolls, the huge impact force overcomes the preload of the pressure spring, pushing the second bearing seat and the second roll backward together, instantly widening the roll gap to allow the hard object to pass through. Afterward, under the action of the pressure spring, the second roll automatically resets. This process effectively avoids equipment jamming, roll damage, or transmission system damage, providing excellent overload protection. Through the synchronization mechanism composed of the linkage shaft and bevel gear pair, the operator only needs to rotate the linkage shaft in one position to simultaneously drive the adjusting screws on both sides to move forward and backward by the same amount, ensuring that the displacement of both ends of the second roll is completely synchronized, thereby ensuring the uniformity of the roll gap. This not only improves the quality consistency of the crushed product but also avoids roll wear caused by uneven roll gap. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a top view of the overall structure of this utility model;

[0020] Figure 2 This is a partial cross-sectional view of the present invention.

[0021] In the diagram: 1. Frame; 11. Guide groove; 2. First roll; 3. Second roll; 4. First bearing housing; 5. Second bearing housing; 51. Limiting protrusion; 6. Adjusting screw; 7. Spring buffer device; 71. Guide rod; 72. Pressure spring; 73. Locking nut; 74. Snap ring; 8. Thrust bearing; 9. Linkage shaft; 10. Bevel gear pair; 101. Driven bevel gear; 102. Driving bevel gear. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-2 As shown, the differential speed double-roll feed crusher of this embodiment includes a frame 1, a first roll 2 and a second roll 3 arranged parallel to each other within the frame 1, and an adjustment mechanism for adjusting the roll gap between the first roll 2 and the second roll 3.

[0024] A pair of first bearing seats 4 are fixedly installed on the frame 1, and the two ends of the first roll 2 are supported in the first bearing seats 4 by bearings;

[0025] The frame 1 is also provided with a pair of second bearing seats 5 that can move radially along the rolls, and the two ends of the second rolls 3 are supported in the second bearing seats 5 by bearings;

[0026] The adjustment mechanism includes two adjusting screws 6, each adjusting screw 6 is threaded into the frame 1, and its end abuts against a second bearing seat 5;

[0027] A spring buffer device 7 is provided between the second bearing housing 5 and the frame 1;

[0028] The spring buffer device 7 includes a guide rod 71, a pressure spring 72, and a locking nut 73. One end of the guide rod 71 is fixedly connected to or movably abuts against the second bearing seat 5, and the other end passes through a through hole opened on the frame 1. The pressure spring 72 is sleeved on the guide rod 71 and pre-compressed between the second bearing seat 5 and the frame 1. The locking nut 73 is threadedly connected to the end of the guide rod 71 located on the outside of the frame 1.

[0029] The compression spring 72 is a disc spring assembly.

[0030] A thrust bearing 8 is installed between the end of the adjusting screw 6 and the contact surface of the second bearing seat 5.

[0031] The bottom or side of the second bearing seat 5 is provided with a limiting protrusion 51, and the frame 1 is provided with a guide groove 11 that cooperates with the limiting protrusion 51. The second bearing seat 5 is slidably connected to the frame 1 through the cooperation of the limiting protrusion 51 and the guide groove 11.

[0032] The adjustment mechanism also includes a linkage shaft 9 and a bevel gear pair 10. A driven bevel gear 101 is installed at the end of each of the two adjustment screws 6. The linkage shaft 9 is rotatably supported on the frame 1, and a driving bevel gear 102 that meshes with the driven bevel gear 101 is installed at each end of the shaft.

[0033] The end of the guide rod 71 that is connected to the second bearing seat 5 is provided with a retaining ring 74 to prevent it from falling off the second bearing seat 5.

[0034] The working principle of this utility model is as follows:

[0035] The first roll 2 is fixedly mounted on the frame 1 via first bearing seats 4 at both ends. The second roll 3 is mounted on the frame 1 via second bearing seats 5 at both ends. The bottom of the second bearing seat 5 is provided with a protruding limiting protrusion 51, which is embedded in the corresponding guide groove 11 on the frame 1, so that the second bearing seat 5 can slide along the direction of the guide groove 11 (i.e., the radial direction of the roll), thereby realizing the movement of the second roll 3.

[0036] The adjusting mechanism includes two adjusting screws 6, a linkage shaft 9, and a set of bevel gear pairs 10. The adjusting screws 6 are threaded into the frame 1. Each adjusting screw 6 has a driven bevel gear 101 installed at its end. The linkage shaft 9 is supported on the frame 1 by bearings, and each end of it has a driving bevel gear 102, which meshes with the corresponding driven bevel gear 101. When the linkage shaft 9 is rotated by a handle or tool, power is synchronously transmitted to the two adjusting screws 6 through the bevel gear pair 10, causing them to rotate synchronously. A thrust bearing 8 is installed between the end of the adjusting screw 6 and the second bearing seat 5, converting the rotational motion of the screw into linear thrust, which pushes the second bearing seat 5 to move to adjust the roller gap.

[0037] A spring buffer device 7 is provided between the second bearing housing 5 and the frame 1. This device includes a guide rod 71, a set of disc springs serving as pressure springs 72, a locking nut 73, and a retaining ring 74. One end of the guide rod 71 is movably connected to the second bearing housing 5 via the retaining ring 74 (to prevent dislodgement but allow for a certain amount of movement), and the other end passes through a through hole in the frame 1. The disc springs are fitted onto the guide rod 71 and are pre-compressed between the second bearing housing 5 and the frame 1. By tightening the locking nut 73 at the end of the guide rod 71 on the outer side of the frame 1, the preload of the springs can be adjusted, thereby setting the initial pressure of the buffer device.

[0038] During operation, the power unit drives the first roller 2 and the second roller 3 to rotate in opposite directions at different speeds. Material is fed in from above the rollers, bitten and crushed. The roller gap can be precisely and synchronously adjusted by rotating the linkage shaft 9. When a hard object passes through, the impact force pushes the second roller 3 and the second bearing seat 5 to compress the disc spring assembly and retract, allowing the object to pass. After the object passes, it automatically resets under the spring force, protecting the equipment from damage.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A differential speed double-roll feed crusher, comprising a frame (1), a first roll (2) and a second roll (3) arranged parallel to each other within the frame (1), and an adjusting mechanism for adjusting the roll gap between the first roll (2) and the second roll (3), characterized in that: A pair of first bearing seats (4) are fixedly installed on the frame (1), and the two ends of the first roll (2) are supported in the first bearing seats (4) by bearings; The frame (1) is also provided with a pair of second bearing seats (5) that can move radially along the rolls, and the two ends of the second rolls (3) are supported in the second bearing seats (5) by bearings; The adjustment mechanism includes two adjusting screws (6), each of which is threaded into the frame (1) and its end abuts against a second bearing seat (5); A spring buffer device (7) is provided between the second bearing housing (5) and the frame (1); The spring buffer device (7) includes a guide rod (71), a pressure spring (72) and a locking nut (73). One end of the guide rod (71) is fixedly connected to or movably abuts against the second bearing seat (5), and the other end passes through a through hole opened on the frame (1). The pressure spring (72) is sleeved on the guide rod (71) and pre-compressed between the second bearing seat (5) and the frame (1). The locking nut (73) is threadedly connected to the end of the guide rod (71) located outside the frame (1).

2. The differential speed double-roller feed crusher according to claim 1, characterized in that: The pressure spring (72) is a butterfly spring assembly.

3. A differential speed double-roller feed crusher according to claim 1, characterized in that: A thrust bearing (8) is installed between the end of the adjusting screw (6) and the contact surface of the second bearing seat (5).

4. A differential speed double-roller feed crusher according to claim 1, characterized in that: The bottom or side of the second bearing seat (5) is provided with a limiting protrusion (51), and the frame (1) is provided with a guide groove (11) that cooperates with the limiting protrusion (51). The second bearing seat (5) is slidably connected to the frame (1) through the cooperation of the limiting protrusion (51) and the guide groove (11).

5. A differential speed double-roller feed crusher according to claim 1, characterized in that: The adjustment mechanism also includes a linkage shaft (9) and a bevel gear pair (10). A driven bevel gear (101) is installed at the end of each of the two adjustment screws (6). The linkage shaft (9) is rotatably supported on the frame (1), and a driving bevel gear (102) that meshes with the driven bevel gear (101) is installed at each end of it.

6. A differential speed double-roller feed crusher according to claim 1, characterized in that: The guide rod (71) is provided with a retaining ring (74) at one end where it is connected to the second bearing seat (5) to prevent it from coming off the second bearing seat (5).

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