Extrusion type crusher

Abstract

The invention belongs to the technical field of crushers, and particularly relates to an extrusion type crusher. The invention provides an extrusion type crusher convenient for adjusting the size of an ore inlet. The device comprises a rack 1, a rotating shaft 2, a roller 3 rotatably and eccentrically arranged on the rotating shaft 2, an upper rotating body 4, a lower rotating body 5, a rotating shaft 6, a connecting rod 7 and an adjusting device 8 used for adjusting the unbalance load of the lower rotating body 5, and is characterized in that the rotating shaft 6, the rotating shaft 2 and the adjusting device 8 are arranged on the rack 1, and the lower end of the upper rotating body 4 is connected with the upper end of the lower rotating body 5 through the rotating shaft 6; the lower part of the lower rotator 5 is coupled with an adjusting driving output end of the adjusting device 8, the upper end of the connecting rod 7 is coupled with the upper end of the upper rotator 4, and the lower end of the connecting rod 7 is coupled with the rack 1; the connecting rod 7 is a detachable piece or a telescopic piece.

Description

Technical Field

[0001] The invention belongs to the technical field of crushers, and in particular relates to an extrusion type crusher. Background Art

[0002] For the crushing of ore, primary crushing must be carried out first. At present, for the primary crushing of hard rock mines, the available crushing equipment is basically jaw crusher and gyratory crusher. For large-scale hard rock mines, gyratory crusher is basically the only choice. However, the structural principle of gyratory crusher leads to many inherent problems of the equipment that are difficult to solve: 1. The equipment is high and has a large dynamic load, which leads to a large investment in civil foundation and a long construction period. 2. There are many types of spare parts, which makes it difficult to overhaul and maintain, and the shutdown time is long. 3. The crushing stroke of the feed port is small and easy to block the mine, which requires frequent processing with a matching crushing arm. 4. The equipment is difficult to design and manufacture, and the procurement cost is high. Therefore, gyratory crusher is currently the only choice for large-scale hard rock mines, forcing users to accept its inherent problems.

[0003] The "guide element 5" described in the CN201380056927-eccentric roller crusher patent is an integral component fixedly connected to the frame. During the liner replacement process, this component needs to be removed as a whole, which requires a large lifting requirement. However, for a narrow working space, the large lifting requirement cannot be met. Secondly, this component is rigidly connected, and the equipment cannot be effectively protected when processing hard and difficult-to-crush objects, resulting in large losses. In addition, when the mine entrance needs to be changed, the "guide element 5" needs to be replaced as a whole to achieve it, which corresponds to a greater cost and workload.

[0004] In the patent of CN201380068691-roller crusher, a method of lifting a "wedge" with a hydraulic cylinder is used to change the discharge port of the equipment and protect the equipment when passing through difficult-to-crush objects. The shortcomings of this structure are: 1. The up and down movement of the "wedge" needs to rely on the electronic control system to issue instructions and the hydraulic system to execute related actions to complete. The sudden increase in load caused by the difficult-to-crush objects entering the crushing chamber is instantaneous. The response speed of the entire control and execution of the protection action cannot match the speed of the sudden increase in load, which is bound to cause the accumulation of equipment damage. 2. If the angle of the "wedge" is small, self-locking will occur, and its sinking protection action will be hindered by friction, resulting in delayed action. If the angle is increased and the self-locking is eliminated, the main components of the equipment still have to bear most of the proportion of the instantaneous sudden increase in load, which will inevitably cause damage to related components. Therefore, no matter how the wedge angle of the "wedge" is designed, it cannot achieve a timely protection effect. 3. When the equipment is squeezing and crushing ore, material overloading is inevitable, which is particularly serious for equipment with larger widths. As a result, the lifting force required on both sides of the wedge in the width direction is different. This structure will inevitably cause the wedge to be lifted and lowered unsmoothly when the ore is overloaded and squeezed in large-width equipment, affecting the equipment's operating status and even causing obstruction in adjustment and protection actions. Summary of the invention

[0005] The present invention aims at solving the above problems and provides an extrusion crusher which is convenient for adjusting the size of the mine entrance.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme, which includes a frame 1, a rotating shaft 2, a rotatable eccentric roller 3 arranged on the rotating shaft 2, an upper rotating body 4, a lower rotating body 5, a rotating shaft 6, a connecting rod 7 and an adjusting device 8 for adjusting the eccentric load of the lower rotating body 5. It is characterized in that the frame 1 is provided with a rotating shaft 6, a rotating shaft 2 and an adjusting device 8, the lower end of the upper rotating body 4 is connected to the upper end of the lower rotating body 5 through the rotating shaft 6, the lower part of the lower rotating body 5 is axially connected to the adjusting drive output end of the adjusting device 8, the upper end of the connecting rod 7 is axially connected to the upper end of the upper rotating body 4, and the lower end of the connecting rod 7 is axially connected to the frame 1; the connecting rod 7 is a detachable part or a retractable part.

[0007] As a preferred embodiment, the rotating shaft 2 of the present invention includes an eccentric shaft 2-2, a first flywheel 2-1, a second flywheel 2-5, a first bearing 2-3 and a second bearing 2-4. The second bearings 2-4 are arranged on both sides of the middle part of the eccentric shaft 2-2, and the roller 3 is connected to the eccentric shaft 2-2 through the second bearing 2-4; the first bearing 2-3 is arranged on the eccentric shaft 2-2 outside the second bearing 2-4; the first flywheel 2-1 is arranged at one end of the eccentric shaft 2-2, and the second flywheel 2-5 is arranged at the other end of the eccentric shaft 2-2.

[0008] As another preferred embodiment, a bearing seat plate 2-31 is provided on the rotating shaft 2 of the present invention. The bearing seat plate 2-31 is installed on the eccentric shaft 2-2 on the rotating shaft 2 through the first bearing 2-3 on the rotating shaft 2. A pin shaft hole 2-32 and a threaded hole 2-33 are provided on the bearing seat plate 2-31.

[0009] As another preferred embodiment, the pin shaft hole 2-32 of the present invention is arranged at the end of the bearing seat plate 2-31, and the threaded holes 2-33 are evenly distributed around the rotating shaft 2.

[0010] As another preferred embodiment, the frame 1 described in the present invention includes a first side plate 1-1 and a second side plate 1-2, the upper part of the first side plate 1-1 is connected to the upper part of the second side plate 1-2 by a connecting beam 1-3, the inner side of the front part of the first side plate 1-1 and the second side plate 1-2 is a bottom plate 1-31, the outer side of the bottom plate 1-31 is an auxiliary plate 1-32, the bottom plate 1-31 is provided with a light hole 1-34 corresponding to the threaded hole 2-33 on the bearing seat plate 2-31 on the rotating shaft 2, and the auxiliary plate 1-32 is provided with a pin shaft hole 1-33 corresponding to the pin shaft hole 2-32; the bearing seat plate 2-31 is placed between the bottom plate 1-31 and the auxiliary plate 1-32.

[0011] As another preferred embodiment, the rotating shaft 6 of the present invention comprises a middle cylinder 6-2, and both ends of the middle cylinder 6-2 are end cylinders 6-1, and the diameter of the end cylinder 6-1 is smaller than the diameter of the middle cylinder 6-2.

[0012] As another preferred embodiment, a first connecting section 1-11 is provided on the upper portion of the first side plate 1-1 of the present invention, a second connecting section 1-12 is provided on the upper portion of the second side plate 1-2, and a hole 1-13 adapted to the end cylinder 6-1 of the rotating shaft 6 is provided on the first connecting section 1-11 and the second connecting section 1-12.

[0013] As another preferred solution, in the present invention, the first connecting section 1-11 and the second connecting section 1-12 are connected to the side plate of the frame 1 through a bolt assembly 1-17.

[0014] As another preferred embodiment, the bolt connection holes between the first connecting section 1-11 and the second connecting section 1-12 and the side plate of the frame 1 of the present invention are long holes, the lower end surfaces of the first connecting section 1-11 and the second connecting section 1-12 and the upper end surface of the plate of the side frame 1 are connected by a bolt assembly 1-17, and a gasket 1-16 is arranged between the lower end surfaces of the first connecting section 1-11 and the second connecting section 1-12 and the upper end surface of the side plate of the frame 1.

[0015] As another preferred embodiment, an upper wear-resistant lining plate 4-2 is provided inside the upper rotating body 4 of the present invention.

[0016] As another preferred embodiment, a lower wear-resistant lining plate 5 - 2 is provided inside the lower rotating body 5 of the present invention.

[0017] As another preferred embodiment, the roller 3 of the present invention is provided with a roller wear-resistant lining 3 - 1 .

[0018] As another preferred embodiment, the surface of the roller wear-resistant lining 3-1 of the present invention is serrated.

[0019] As another preferred embodiment, the inlet 10 is between the upper part of the roller 3 close to the upper rotating body 4 and the upper end of the upper rotating body 4, and the outlet 11 is between the lower part of the roller 3 close to the lower rotating body 5 and the lower end of the lower rotating body 5; the inlet 10 is larger than the outlet 11 and gradually transitions in an arc shape.

[0020] As another preferred embodiment, the upper wear-resistant liner 4-2 and the lower wear-resistant liner 5-2 of the present invention form an arc-shaped crushing wall.

[0021] As another preferred embodiment, the lower end of the upper rotating body 4 of the present invention is provided with an upper rotating body hole 4-3 corresponding to the middle cylinder 6-2 of the rotating shaft 6; the upper wear-resistant lining plate 4-2 on the upper rotating body 4 is connected to the upper rotating body 4 through an upper bolt assembly 4-4.

[0022] As another preferred embodiment, the lower rotating body 5 of the present invention is provided with a lower rotating body hole 5-1 at the upper end corresponding to the middle cylinder 6-2 of the rotating shaft 6; the lower wear-resistant lining 5-2 on the lower rotating body 5 is connected to the lower rotating body 5 through a lower bolt assembly 5-3.

[0023] As another preferred embodiment, the upper end of the connecting rod 7 of the present invention is provided with a connecting rod upper hole 7-2 corresponding to the extension section 4-1 on both sides of the upper end of the upper rotating body 4; the lower end of the connecting rod 7 is provided with a connecting rod lower hole 7-1 corresponding to the frame hole 1-18 at the front upper end of the frame 1.

[0024] As another preferred embodiment, the adjusting device 8 of the present invention comprises a rotating shaft 8-1, a pressure rod 8-2 and an adjusting rod 8-3, a rotating shaft hole 8-13 provided in the rotating shaft 8-1 is adapted to a side plate hole 1-14 provided on the rear part of the side plate of the frame 1, and a pin is inserted into the rotating shaft hole 8-13 and the side plate hole 1-14;

[0025] A rear convex arm 8-12 is arranged on the rear side of the rotating shaft 8-1, and a lower convex arm 8-11 is arranged on the lower end of the rotating shaft 8-1. The rear end of the pressure rod 8-2 is hinged to the lower convex arm 8-11 through a pin, and the front end of the pressure rod 8-2 is hinged to the lower hole 5-4 of the lower rotating body 5 at the lower part of the lower rotating body 5 through a pin; the lower end of the adjusting rod 8-3 is hinged to the rear convex arm 8-12 through a pin, and the upper end of the adjusting rod 8-3 is hinged to the hinge hole 1-15 arranged at the rear end of the frame 1 through a pin.

[0026] Secondly, the connecting rod 7 of the present invention is a mechanical pull rod structure or a hydraulic cylinder pull rod structure.

[0027] In addition, the adjusting rod 8-3 described in the present invention adopts a hydraulic cylinder + accumulator combination structure, or a spring rod structure, or a mechanical rod structure that is damaged when the load exceeds the limit.

[0028] The invention has beneficial effects.

[0029] The lower end of the upper rotating body 4 of the present invention is rotatably connected to the rotating shaft 6, and the upper end of the upper rotating body 4 is connected to the frame 1 by a connecting rod 7, and the connecting rod 7 is a detachable or retractable part. The gap between the upper end of the upper rotating body 4 and the roller 3 on the rotating shaft 2 is the equipment's mine inlet, and also serves as the beginning of the arc-shaped crushing chamber. The functions that can be achieved by this structure are: 1. When the size of the mine inlet needs to be adjusted, it can be achieved by changing the length of the connecting rod 7, and the replacement cost is low and the replacement is convenient. 2. When entering larger difficult-to-crush objects, in order to prevent the main components of the equipment from being damaged, the connecting rod 7 can be made into a mechanical pull rod form that breaks when a predetermined load is reached, or a hydraulic cylinder pull rod form can be used, and a retreat alarm is issued when the pressure reaches a predetermined value, thereby achieving early processing of difficult-to-crush objects. 3. When replacing the wear-resistant linings on the upper rotating body 4 and the lower rotating body 5, the connecting rod 7 can be removed, and the upper rotating body 4 can be rotated along the rotating shaft 6 by a certain angle as a whole, so that the linings on the upper rotating body 4 and the lower rotating body 5 are exposed, which is convenient for lifting and replacement. Whether it is the removal of the connecting rod 7, the rotation of the upper rotating body 4 along the rotating shaft 6, or the replacement of the wear-resistant lining, only small lifting requirements are required, and the requirements are similar, which will bring greater convenience to inspection and maintenance, and increase the adaptability of the equipment to on-site conditions.

[0030] The present invention is a primary crushing device that can replace the gyratory crusher as an ideal solution for primary crushing in large hard rock mines. It solves the inherent problems of the primary crushing system currently using the gyratory crusher. It reduces the user's construction investment in the primary crushing system, shortens the construction period, and reduces the difficulty of later maintenance and operating costs, becoming a better solution in the field of primary crushing in hard rock mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

[0032] Attached Figure 1 It is a schematic structural diagram of the extrusion crusher of the present invention.

[0033] Attached Figure 2 It is a schematic diagram of the cross-sectional structure of the rotating body of the present invention.

[0034] Attached Figure 3 It is a schematic diagram of the rotary structure of the present invention.

[0035] Attached Figure 4 It is a structural schematic diagram of the frame of the present invention.

[0036] Attached Figure 5 It is a schematic structural diagram of the regulating device of the present invention.

[0037] Attached Figure 6 It is a schematic structural diagram of the upper rotating body of the present invention.

[0038] Attached Figure 7 It is a schematic structural diagram of the lower rotating body of the present invention.

[0039] Attached Figure 8 It is a schematic diagram of the rotating shaft structure of the present invention.

[0040] Attached Fig. 9 It is a schematic structural diagram of the connecting rod of the present invention.

[0041] Attached Fig.10 The present invention is provided with a schematic diagram of the structure of the pre-screening device.

[0042] Attached Fig.11 It is a schematic structural diagram of the screening device of the present invention.

[0043] Attached Fig.12 It is a structural schematic diagram of the lap frame of the present invention.

[0044] Attached Fig.13 It is a schematic structural diagram of the screening frame of the present invention.

[0045] Attached Fig.14 It is a schematic structural diagram of the auxiliary screening device of the present invention.

[0046] Attached Fig.15 It is a schematic diagram of the connection relationship between the screening device and the auxiliary screening device of the present invention.

[0047] Attached Fig.16 It is a schematic diagram of the assembly of the screening device, the auxiliary screening device and the frame of the present invention.

[0048] Description of the serial numbers in the attached drawings:

[0049] Frame 1, first connecting section 1-11, side plate hole 1-14, hinge hole 1-15, gasket 1-16, bolt assembly 1-17, frame hole 1-18, bottom plate 1-31, auxiliary plate 1-32, pin hole 1-33, light hole 1-34, rotary shaft 2, first flywheel 2-1, eccentric shaft 2-2, first bearing 2-3, second bearing 2-4, second flywheel 2-5, bearing seat plate 2-31, pin hole 2-32, threaded hole 2-33, roller 3, roller wear-resistant lining 3-1, upper rotating body 4, extension section 4-1, upper wear-resistant lining 4-2, upper rotating body hole 4-3, upper bolt assembly 4-4, lower rotating body 5, lower rotating body hole 5-1, lower wear-resistant lining 5-2, lower bolt assembly 5-3, lower rotating body lower hole 5-4, rotating shaft 6 , end cylinder 6-1, middle cylinder 6-2, connecting rod 7, connecting rod lower hole 7-1, connecting rod upper hole 7-2, adjusting device 8, rotating shaft 8-1, pressure rod 8-2, adjusting rod 8-3, lower convex arm 8-11, rear convex arm 8-12, rotating shaft hole 8-13, inlet 10, outlet 11, serrated groove 3-1-1, support 1-22, support 1-21, arc-shaped crushing wall 30, screening device 40, lap frame 40-1, screening frame 40-2, screen bar 40-22, opening groove 40-11, card-joined frame 40-21, screen bar 40-22, extension bar 40-31, hinge hole 40-32, card slot 40-51, beam 40-61, auxiliary screening device 50, auxiliary screening rod 50-2, supporting wheel 50-11, connecting arm 50-3. DETAILED DESCRIPTION

[0050] like Figure 1 As shown, the present invention includes a frame 1, a rotating shaft 2, a rotatable eccentric roller 3 arranged on the rotating shaft 2, an upper rotating body 4, a lower rotating body 5, a rotating shaft 6, a connecting rod 7 and an adjusting device 8 for adjusting the eccentric load of the lower rotating body 5. The frame 1 is provided with a rotating shaft 6, a rotating shaft 2 and an adjusting device 8. The lower end of the upper rotating body 4 is connected to the upper end of the lower rotating body 5 through the rotating shaft 6. The lower part of the lower rotating body 5 is axially connected to the adjusting drive output end of the adjusting device 8. The upper end of the connecting rod 7 is axially connected to the upper end of the upper rotating body 4. The lower end of the connecting rod 7 is axially connected to the frame 1. The connecting rod 7 is a detachable part or a retractable part.

[0051] The rotating shaft 2 includes an eccentric shaft 2-2, a first flywheel 2-1, a second flywheel 2-5, a first bearing 2-3 and a second bearing 2-4. The second bearings 2-4 are arranged on both sides of the middle part of the eccentric shaft 2-2, and the roller 3 is connected to the eccentric shaft 2-2 through the second bearings 2-4; the first bearing 2-3 is arranged on the eccentric shaft 2-2 outside the second bearing 2-4; the first flywheel 2-1 is arranged at one end of the eccentric shaft 2-2, and the second flywheel 2-5 is arranged at the other end of the eccentric shaft 2-2.

[0052] When the eccentric shaft 2-2 rotates, the roller 3, under the positioning effect of the second bearing 2-4, will rotate in a circle around the rotation center line of the eccentric shaft 2-2 with a certain eccentric distance as the radius.

[0053] The rotating parts on the rotating shaft 2 are all on the same rotating axis (ie, the rotating axis of the first flywheel 2-1 and the second flywheel 2-5). The belt drives the first flywheel 2-1 to rotate.

[0054] All rotating parts on the rotating shaft 2 are on the same rotating axis. The existing unbalanced mass can be completely balanced by adding or removing counterweights on the first flywheel 2-1 and the second flywheel 2-5, thereby controlling the dynamic load of the equipment at a very low state and reducing the strength requirements of the equipment on the foundation civil engineering.

[0055] The angle between the plane formed by the axis of the rotating shaft 6 and the axis of the rotary shaft 2 and the horizontal plane where the axis of the rotary shaft 2 is located is less than 45°.

[0056] The angle between the plane formed by the axis of the rotating shaft 8 - 1 and the axis of the rotating shaft 2 and the horizontal plane where the axis of the rotating shaft 2 is located is less than 20°.

[0057] A bearing seat plate 2-31 is arranged on the rotating shaft 2. The bearing seat plate 2-31 is installed on the eccentric shaft 2-2 on the rotating shaft 2 through the first bearing 2-3 on the rotating shaft 2. A pin shaft hole 2-32 and a threaded hole 2-33 are arranged on the bearing seat plate 2-31.

[0058] The pin shaft hole 2-32 is arranged at the end of the bearing seat plate 2-31, and the threaded holes 2-33 are evenly distributed around the rotating shaft 2.

[0059] The frame 1 includes a first side plate 1-1 and a second side plate 1-2. The upper part of the first side plate 1-1 is connected to the upper part of the second side plate 1-2 through a connecting beam 1-3. The inner side of the front part of the first side plate 1-1 and the second side plate 1-2 is a bottom plate 1-31, and the outer side of the bottom plate 1-31 is an auxiliary plate 1-32. The bottom plate 1-31 is provided with a light hole 1-34 corresponding to the threaded hole 2-33 on the bearing seat plate 2-31 on the rotary shaft 2, and the auxiliary plate 1-32 is provided with a pin hole 1-33 corresponding to the pin hole 2-32; the bearing seat plate 2-31 is placed between the bottom plate 1-31 and the auxiliary plate 1-32. The bearing seat plate 2-31 is connected to the bottom plate 1-31 by bolts.

[0060] The number of the pin holes 2-32 on the bearing seat plate 2-31 on each side of the rotary shaft 2 is consistent with the number of the pin holes 1-33 set on each side plate of the frame 1. When the bearing seat plate 2-31 is placed between the bottom plate 1-31 and the auxiliary plate 1-32, the pins are inserted to connect and fix. Then, the threaded holes 2-33, the light holes 1-34 and the bolt assembly are used to connect and fasten the bearing seat plate 2-31 to the bottom plate 1-31.

[0061] The rotating shaft 6 includes a middle cylinder 6 - 2 , and both ends of the middle cylinder 6 - 2 are end cylinders 6 - 1 , and the diameter of the end cylinder 6 - 1 is smaller than the diameter of the middle cylinder 6 - 2 .

[0062] The upper rotating body 4 and the lower rotating body 5 are connected to form a whole through a rotating shaft 6 and are installed in the frame 1.

[0063] A first connecting section 1-11 is disposed on the upper portion of the first side plate 1-1, and a second connecting section 1-12 is disposed on the upper portion of the second side plate 1-2. The first connecting section 1-11 and the second connecting section 1-12 are provided with holes 1-13 adapted to the end cylinder 6-1 of the rotating shaft 6.

[0064] The first connecting section 1 - 11 and the second connecting section 1 - 12 are connected to the side plate of the frame 1 through a bolt assembly 1 - 17.

[0065] The bolt connection holes between the first connecting section 1-11 and the second connecting section 1-12 and the side plate of the frame 1 are long holes, the lower end surfaces of the first connecting section 1-11 and the second connecting section 1-12 and the upper end surfaces of the side plate of the frame 1 are connected by bolt assemblies 1-17, and gaskets 1-16 are arranged between the lower end surfaces of the first connecting section 1-11 and the second connecting section 1-12 and the upper end surfaces of the side plate of the frame 1.

[0066] The bolt connection holes corresponding to the bolt assemblies 1-17 connecting the first connection section 1-11 and the second connection section 1-12 with the side plates are set as long holes, and at the same time, the gaskets at the joint surface 1-16 are increased or decreased to achieve the change of the position of the first connection section 1-11 and the second connection section 1-12 relative to the first side plate 1-1 and the second side plate 1-2, thereby achieving the change of the position of the arc-shaped crushing wall relative to the roller wear-resistant lining 3-1, thereby changing the shape of the arc-shaped crushing chamber to adapt to the working conditions.

[0067] An upper wear-resistant lining plate 4 - 2 is arranged on the inner side of the upper rotating body 4 .

[0068] A lower wear-resistant lining plate 5 - 2 is arranged on the inner side of the lower rotating body 5 .

[0069] The roller 3 is provided with a roller wear-resistant lining 3 - 1 .

[0070] The upper wear-resistant lining 4-2, the lower wear-resistant lining 5-2 and the roller wear-resistant lining 3-1 can be made of wear-resistant materials such as high manganese steel, wear-resistant alloy steel and composite materials, and are assembled on related parts. They can be replaced separately after wear. The wearing parts are small in size, easy to replace, and have low requirements for on-site lifting capacity.

[0071] The surface of the roller wear-resistant lining 3-1 is serrated.

[0072] The surface of the roller wear-resistant lining 3-1 is serrated, which can easily bend and crush the material, or locally form a high compressive stress concentration, causing the material to have a crack source and facilitate crushing. The upper wear-resistant lining 4-2 and the lower wear-resistant lining 5-2 are not serrated because both sides have serrated linings, which can easily generate axial force when squeezing ore, thereby affecting the service life of other parts such as the main bearing of the equipment.

[0073] The lower wear-resistant lining plate 5 - 2 on the lower rotating body 5 and the upper wear-resistant lining plate 4 - 2 on the upper rotating body 4 form an integral arc-shaped crushing wall, and together with the surface of the roller 3 on the rotary shaft 2 form an arc-shaped crushing chamber with a large inlet and a small outlet.

[0074] When the rotary shaft 2 rotates, the eccentrically and rotatably arranged roller 3 on it is driven to rotate, and the roller wear-resistant lining 3-1 on the roller 3 approaches and moves away from the arc-shaped crushing wall with a certain amplitude and periodically, thereby continuously squeezing the ore entering the crushing chamber.

[0075] An inlet 10 is formed between the upper part of the roller 3 near the upper rotating body 4 and the upper end of the upper rotating body 4, and an outlet 11 is formed between the lower part of the roller 3 near the lower rotating body 5 and the lower end of the lower rotating body 5; the inlet 10 is larger than the outlet 11 and transitions gradually in an arc shape.

[0076] like Figure 1 As shown, the size of the inlet 10 of the crushing chamber is the distance G between the uppermost part of the upper wear-resistant lining plate 4-2 and the surface of the roller wear-resistant lining plate 3-1, and the size of the outlet of the crushing chamber is the distance H between the lowermost part of the lower wear-resistant lining plate 5-2 and the surface of the roller wear-resistant lining plate 3-1.

[0077] The inlet size G can be adjusted by changing the length of the connecting rod 7, which is lower in cost and more convenient to operate than the prior art. The connecting rod 7 can also be set as a hydraulic cylinder structure to adjust the size of the mine inlet, and at the same time, the accurate crushing force required for crushing large pieces of materials with different hardness entering the mine inlet can be collected.

[0078] The outlet size H can be adjusted by changing the length of the adjusting rod 8-3. The adjusting rod 8-3 can be in the form of a combination of a hydraulic cylinder and an accumulator to provide the crushing force required for crushing the ore, and when the crushing chamber enters the difficult-to-crush object, the accumulator quickly buffers and timely protects the relevant components, and the hydraulic cylinder retracts to drive the rotating shaft 8-1 to rotate, and further the pressure rod 8-2 drives the lower rotating body 5 to rotate along the rotating shaft 6 by a certain angle, thereby increasing the distance H, thereby discharging the difficult-to-crush objects, and then the hydraulic cylinder extends to reduce the distance H, thereby restoring the original discharge port size, and realizing iron protection and release.

[0079] The crushing equipment of the present invention has wider adaptability, smoother adjustment of the ore supply and discharge ports, more timely iron overload protection, and more convenient maintenance and repair, thereby significantly improving its operating efficiency.

[0080] The upper wear-resistant lining plate 4-2 and the lower wear-resistant lining plate 5-2 form an arc-shaped crushing wall.

[0081] An upper rotating body hole 4-3 is provided at the lower end of the upper rotating body 4 corresponding to the middle cylinder 6-2 of the rotating shaft 6; an upper wear-resistant lining plate 4-2 on the upper rotating body 4 is connected to the upper rotating body 4 through an upper bolt assembly 4-4.

[0082] The upper end of the lower rotating body 5 is provided with a lower rotating body hole 5-1 corresponding to the middle cylinder 6-2 of the rotating shaft 6; the lower wear-resistant lining plate 5-2 on the lower rotating body 5 is connected to the lower rotating body 5 through a lower bolt assembly 5-3.

[0083] The upper end of the connecting rod 7 is provided with a connecting rod upper hole 7-2 corresponding to the extension section 4-1 on both sides of the upper end of the upper rotating body 4; the lower end of the connecting rod 7 is provided with a connecting rod lower hole 7-1 corresponding to the frame hole 1-18 at the front upper end of the frame 1 (the pin shaft penetrates the frame hole 1-18 and the connecting rod lower hole 7-1), and the lower end of the connecting rod 7 can rotate around the pin shaft.

[0084] The extension section 4-1 provided on the upper rotating body 4 can be formed by a through shaft penetrating the upper part of the upper rotating body 4, with a section exposed at each end. The upper rotating body 4 is a whole or is formed by a plurality of monomers arranged side by side.

[0085] The adjusting device 8 comprises a rotating shaft 8-1, a pressure rod 8-2 and an adjusting rod 8-3, a rotating shaft hole 8-13 provided in the rotating shaft 8-1 is adapted to a side plate hole 1-14 provided on the rear part of the side plate of the frame 1, and a pin is inserted into the rotating shaft hole 8-13 and the side plate hole 1-14;

[0086] A rear convex arm 8-12 is arranged on the rear side of the rotating shaft 8-1, and a lower convex arm 8-11 is arranged on the lower end of the rotating shaft 8-1. The rear end of the pressure rod 8-2 is hinged to the lower convex arm 8-11 through a pin, and the front end of the pressure rod 8-2 is hinged to the lower hole 5-4 of the lower rotating body 5 at the lower part of the lower rotating body 5 through a pin; the lower end of the adjusting rod 8-3 is hinged to the rear convex arm 8-12 through a pin, and the upper end of the adjusting rod 8-3 is hinged to the hinge hole 1-15 arranged at the rear end of the frame 1 through a pin.

[0087] The lower rotating body 5 can be one or more, and the number of the lower protruding arms 8-11 and the pressure rods 8-2 matches it.

[0088] The lower rotating body 5 can be composed of a whole body or a plurality of monomers combined side by side, and all of them can be rotatably connected to the rotating shaft 6.

[0089] The upper part of the lower rotating body 5 is rotatably connected to the rotating shaft 6, and the lower part thereof is rotatably connected to the pressure rod 8-2. The other end of the pressure rod 8-2 is rotatably connected to the lower convex arm 8-11 of the rotating shaft 8-1 of the adjusting device 8. The rear convex arm 8-12 of the rotating shaft 8-1 of the adjusting device 8 is respectively connected to the two side plates of the frame 1 through the adjusting rod 8-3, and the connection points are all rotatably connected. When the material is overloaded, the lower rotating body 5 relies on the torsional rigidity of the rotating shaft of the adjusting device 8 to maintain a stable shape without skewing, thereby stabilizing the load and crushing effect of the parts. Especially when the width of the lower rotating body 5 is large, or when multiple lower rotating bodies 5 are arranged side by side, the shape of the entire crushing chamber can be kept fixed regardless of whether it is evenly loaded or overloaded. In addition, when the difficult-to-crush object enters between the surface of the roller 3 on the rotating shaft 2 and the lower rotating body 5, the large load will be instantly transmitted to the adjusting rod 8-3, relying on the function of the adjusting rod 8-3 to timely protect the equipment or release the difficult-to-crush object.

[0090] like Figure 5 As shown, an adjustment rod 8-3 can be provided on each side of the rotating shaft 8-1. The number of the adjustment rods 8-3 can be 2, and the number of the rear protruding arms 8-12 can be 2. One end of the two adjustment rods 8-3 can be rotatably connected to the two rear protruding arms 8-12, and the other end of the two adjustment rods 8-3 can be rotatably connected to the holes 1-15 of the side plates 1-1 and 1-2. The number of the lower protruding arms 8-11 is the same as that of the pressure rods 8-2, and there are two or more.

[0091] The rotating shaft 8-1 is rotatably connected to the frame 1, and the rotating shaft hole 8-13 set in the rotating shaft 8-1 is adapted to the side plate hole 1-14 set on the side plate of the frame 1, and can be connected by respectively inserting two sections of pins; or a long pin passes through the hole 8-13 set in the rotating shaft 8-1, the side plate hole 1-14 set on the first side plate 1-1 and the second side plate 1-2 for connection.

[0092] When the equipment is larger in size and requires a larger width, multiple upper rotating bodies 4 and lower rotating bodies 5 can be arranged on the rotating shaft 6, and the number of lower convex arms 8-11 and pressure rods 8-2 corresponds to the number of upper rotating bodies 4 and lower rotating bodies 5, so as to reduce the weight of the large parts. For example, a large lower rotating body 5 is divided into several small lower rotating bodies 5, all of which are connected to the rotating shaft 6; a large upper rotating body 4 is divided into several small upper rotating bodies 4, all of which are connected to the rotating shaft 6.

[0093] The connecting rod 7 can be set as a mechanical pull rod structure, and can also be set as a hydraulic cylinder pull rod structure. The mechanical pull rod structure and the hydraulic cylinder pull rod structure are existing structures.

[0094] The adjusting rod 8-3 adopts a hydraulic cylinder + accumulator combined structure.

[0095] The adjustment rod 8 - 3 can also be set as a spring rod structure or a mechanical rod structure that is damaged when a certain load is exceeded.

[0096] The hydraulic cylinder + accumulator combination structure, the spring rod structure, and the mechanical rod structure that is damaged when the load is exceeded are all existing structures, and those skilled in the art can undoubtedly know the specific construction of the structure.

[0097] The present invention can be provided with a screening device 40, which is arranged on the frame 1, and the roller 3 and the arc-shaped crushing wall 30 form a crushing channel. The screening device 40 is arranged on the side of the inlet 10 of the crushing channel; the screening device 40 includes a lap frame 40-1 and a screening frame 40-2, the screening frame 40-2 is arranged at the upper end of the lap frame 40-1, the rear end of the lap frame 40-1 is hinged to the upper support 1-22 of the frame 1, and the front end of the lap frame 40-1 is overlapped on the roller 3; the screening frame 40-2 is provided with sieve holes.

[0098] The screening device 40 of the present invention comprises a lap frame 40-1 and a screening frame 40-2. The screening frame 40-2 can be replaced with a suitable one according to the size of the material to be screened and the required strength of the screening frame 40-2. The device has strong adaptability.

[0099] The front end of the overlapping frame 40 - 1 of the present invention is overlapped on the roller 3 , so that the screening device 40 can jump along with the roller 3 , thereby improving the screening effect.

[0100] The device of the present invention integrates a pre-screening function in the body, which significantly improves the processing capacity of the crushing equipment. The present invention can replace the gyratory crusher as an ideal solution for primary crushing in large hard rock mines. It solves the inherent problems of the primary crushing system currently using the gyratory crusher. It reduces the user's construction investment in the primary crushing system, shortens the construction period, and reduces the difficulty of later maintenance and operating costs, becoming a better solution in the field of primary crushing in hard rock mines.

[0101] It also includes an auxiliary screening device 50 for the vibration screening device 40, which significantly improves the adaptability of the equipment to working conditions.

[0102] When the eccentric shaft 2-2 rotates, it drives the roller 3 to perform circular runout around the rotation center of the eccentric shaft 2-2.

[0103] The outer end cross section of the roller wear-resistant lining plate 3-1 is a sawtooth groove 3-1-1 with an arc-shaped bottom.

[0104] The surface of the roller wear-resistant lining plate 3-1 on the roller 3 on the rotating shaft 2 and the arc-shaped crushing wall 30 together form a crushing chamber with a large inlet and a small outlet. During the rotation of the eccentric shaft 2-2, the surface of the roller wear-resistant lining plate 3-1 arranged thereon periodically approaches and moves away from the arc-shaped crushing wall 30, thereby extruding and crushing the ore multiple times from the moment it enters the crushing chamber until it is discharged from the crushing chamber.

[0105] The rear end of the lap frame 40-1 is hinged to the upper support 1-22 of the frame 1, so that the lap frame 40-1 can rotate along the hinge point.

[0106] The front end of the lap frame 40-1 is provided with a plurality of extension bars 40-31, which correspond to the sawtooth grooves 3-1-1 on the roller wear-resistant lining plate 3-1 on the roller 3 on the rotary shaft 2. The front end of the extension bar 40-31 is placed in the sawtooth groove 3-1-1.

[0107] The distance between adjacent extension strips 40-31 is equal to the distance D between the sawtooth grooves 3-1-1 (eg Figure 2 When the size of the groove 3-1-1 is designed to be larger, the extension strip 40-31 is also allowed to be larger in size and have higher strength. The number of extension strips 40-31 can be reduced and less than the number of grooves. At this time, the spacing of the extension strips 40-31 is no longer equal to the spacing of the serrated grooves 3-1-1, and may be 2 times or more than 2 times the spacing of the grooves.

[0108] When screening small-sized materials, the existing screen bars need to be widened to reduce the gaps between the screen bars, which will cause the entire screen surface opening rate to decrease, resulting in a decrease in screening efficiency; and when screening large-sized materials, the screen bars need to be narrowed to increase the gaps between the screen bars, which will cause the screen bar strength to weaken and even cause faults such as screen bar bending. The spacing of the extension bars 40-31 set on the lap frame 40-1 of the present invention corresponds to the spacing of the serrated grooves 3-1-1, which can be one-to-one or in multiples. The extension bars 40-31 can be overlapped into the serrated grooves 3-1-1, so that the screening device can jump with the roller 3. When the screen bars 40-22 are set on the screening frame 40-2, it is no longer necessary to consider the matching of parameters such as the size and spacing with the serrated grooves 3-1-1. It is only necessary to design and determine the size and quantity according to the size of the material to be screened and the strength of the required screen bars. For example, the width of roller 3 is 2000mm, the spacing of serrated grooves 3-1-1 is 150mm, and the equipment requires a pre-screening hole of 150mm. At this time, the finger-shaped screen bars in the prior art cannot be achieved (the screen bar width is 0mm) because the spacing needs to correspond to the grooves on the roller body. Therefore, the spacing needs to be set to at least 300mm, the screen bar width is set to 150mm, the spacing is 300mm, the gap (screen hole) between adjacent finger-shaped screen bars is 150mm, and the screen surface opening rate is 46%. By using the structure of the present invention, the spacing of the screen bars 40-22 on the screening frame 40-2 no longer needs to correspond to the spacing of the serrated grooves 3-1-1 of 150 mm, and can be determined to be 80 mm according to the screen bar width to meet the strength requirements. The gap between adjacent screen bars (screen holes) is 150 mm. At this time, the spacing of the screen bars is 230 mm, and the screen surface opening rate is 60%, which is 30% higher than the opening rate of 46% in the prior art. The larger screen surface opening rate corresponds to higher screening efficiency and larger equipment processing capacity.

[0109] The lap frame 40-1 is provided with an open slot 40-11, and beams 40-61 are provided in the middle and on both sides of the open slot 40-11. The screening frame 40-2 is provided with a snap-in frame 40-21 corresponding to the open slot 40-11, and the snap-in frame 40-21 is placed in the open slot 40-11; the screening frame 40-2 is provided with a snap-in slot 40-51 corresponding to the beam 40-61. Following the direction of material movement, the open slot 40-11 snaps the snap-in frame 40-21 for positioning. Following the direction of material movement, the snap-in slot 40-51 matches the beam 40-61 for positioning.

[0110] The overlapping frame 40 - 1 and the screening frame 40 - 2 are integrated into one body through the opening groove 40 - 11 and the clamping frame 40 - 21 to form the screening device 40 .

[0111] The rear portion 40-31-1 of the extension bar 40-31 is trapezoidal, the front portion 40-31-2 of the extension bar 40-31 is rectangular, and the front cross section 40-31-3 of the extension bar 40-31 is trapezoidal. The front cross section 40-31-3 of the extension bar 40-31 is trapezoidal, which has good adaptability to the sawtooth groove 3-1-1. The front portion 40-31-2 of the extension bar 40-31 is rectangular, which matches the size of the sawtooth groove 3-1-1 and can be embedded in the groove. The rear portion 40-31-1 of the extension bar 40-31 is trapezoidal, and the trapezoidal position is far away from the sawtooth groove 3-1-1, which is not limited by the groove size, increases the width, and improves the structural strength.

[0112] The rear end of the lap frame 40 - 1 is provided with a hinge hole 40 - 32 .

[0113] A plurality of screen bars 40 - 22 are evenly distributed on the screening frame 40 - 2 , and screen holes are formed between the screen bars 40 - 22 ; the screen bars 40 - 22 are arranged in a step-wise descending ladder shape along the material running direction.

[0114] It is set up in a step-by-step manner to increase the turnover of the material and facilitate the downward movement of fine-grained materials through the sieve holes.

[0115] The lower end of the middle part of the screen bar 40-22 is a vertical support plate 40-22-1. The vertical support plates 40-22-1 in the same vertical row are integrated vertical support plates, and each vertical row support plate is connected by a horizontal connecting plate 40-22-2.

[0116] The auxiliary screening device 50 includes an auxiliary rotating shaft 50-1 and an auxiliary screening rod 50-2. The auxiliary rotating shaft 50-1 is rotatably arranged on the side plate of the frame 1. A supporting wheel 50-11 is arranged on the inner side of the frame 1 of the auxiliary rotating shaft 50-1. The supporting wheel 50-11 contacts and supports the lower part of the overlapping frame 40-1 of the screening device 40.

[0117] The part of the auxiliary rotating shaft 50-1 placed on the outside of the side plate of the frame 1 is connected to one end of the connecting arm 50-3, the other end of the connecting arm 50-3 is hinged to one end of the auxiliary screening rod 50-2, and the other end of the auxiliary screening rod 50-2 is hinged to the support 1-21 on the outside of the side plate of the frame 1.

[0118] The auxiliary screening rod 50 - 2 is a mechanical spring rod, or a hydraulic spring rod composed of a hydraulic cylinder and an accumulator, or a hydraulic cylinder + excitation hydraulic system.

[0119] The hydraulic spring rod composed of the mechanical spring rod, the hydraulic cylinder and the accumulator, and the hydraulic cylinder + excitation hydraulic system are all existing structures, and those skilled in the art can undoubtedly know the specific structure of the structure.

[0120] Mechanical spring rod: The spring is used as a damper to increase the difficulty of the rod being compressed in the length direction.

[0121] The hydraulic spring rod composed of a hydraulic cylinder and an accumulator connects the oil pressure chamber of the hydraulic cylinder with the accumulator to form a group of hydraulic spring mechanisms. When the hydraulic cylinder is pressurized, the internal oil returns to the accumulator to compress the gas inside the accumulator, the volume of the enclosed gas becomes smaller, the pressure increases, and a reverse push effect is exerted on the oil, thereby increasing the thrust of the hydraulic cylinder and making the hydraulic spring rod less likely to be compressed.

[0122] Hydraulic cylinder + vibration hydraulic system refers to a hydraulic cylinder equipped with a high-frequency vibration hydraulic system. The high-frequency reversing valve controls the hydraulic cylinder to perform high-frequency extension and contraction, thereby driving the pre-screening device to vibrate at high frequency, so that the material can be screened more fully.

[0123] For some low-hardness ores containing more fine particles, the auxiliary screening rod 50-2 can be set in the form of a hydraulic cylinder + excitation hydraulic system, and the hydraulic cylinder is controlled by a high-frequency reversing valve to perform high-frequency expansion and contraction, thereby driving the pre-screening device to also perform high-frequency and high-intensity vibration, so that the material can be more fully screened. Compared with the screening device of the prior art that can only jump with the roller 3, the vibration intensity of the present invention can be greatly improved, and can be controlled and adjusted, so that qualified materials can be fully pre-screened, no longer entering the crushing chamber, occupying the crushing capacity of the crusher, thereby improving the overall processing capacity of the equipment.

[0124] The auxiliary screening rod 50 - 2 is configured as a mechanical spring rod, or a hydraulic spring rod composed of a hydraulic cylinder and an accumulator, which serves as a damper so that the screening device 40 can maintain a stable vibration state along with the rotating shaft 2 under the material pressure.

[0125] The auxiliary screening rod 50-2 can be set as a spring rod to offset a part of the weight of the lap frame 40-1 and the screening frame 40-2 as a whole, so that the lap frame 40-1, the screening frame 40-2 and the upper material thereof vibrate along with the drum 1-1 of the rotating shaft 2.

[0126] The auxiliary screening rod 50-2 can be set as a hydraulic cylinder. Through the controllable frequency and amplitude expansion and contraction of the hydraulic cylinder, the lap frame 40-1, the screening frame 40-2 and the upper material thereof are caused to reciprocate along the support 1-22 as a whole, thereby enhancing the screening effect.

[0127] The auxiliary screening rod 50-2 is configured as a hydraulic cylinder + a specific hydraulic system. Relying on the pump and valve action of the hydraulic system, the hydraulic cylinder generates expansion and contraction of a predetermined frequency and amplitude, thereby causing the screening device 40 and the material thereon to vibrate periodically, and high-intensity pre-screening is performed for difficult-to-screen minerals.

Claims

1. An extrusion crusher, comprising a frame (1), a rotary shaft (2), a roller (3) rotatably and eccentrically arranged on the rotary shaft (2), an upper rotating body (4), a lower rotating body (5), a rotating shaft (6), a connecting rod (7) and an adjusting device (8) for adjusting the eccentric load of the lower rotating body (5), characterized in that A rotating shaft (6), a rotary shaft (2) and an adjusting device (8) are arranged on the frame (1); the lower end of the upper rotating body (4) is connected to the upper end of the lower rotating body (5) through the rotating shaft (6); the lower end of the lower rotating body (5) is axially connected to the adjusting drive output end of the adjusting device (8); the upper end of the connecting rod (7) is axially connected to the upper end of the upper rotating body (4); and the lower end of the connecting rod (7) is axially connected to the frame (1); the connecting rod (7) is a detachable part or a retractable part.

2. An extrusion crusher according to claim 1, characterized in that The rotary shaft (2) comprises an eccentric shaft (2-2), a first flywheel (2-1), a second flywheel (2-5), a first bearing (2-3) and a second bearing (2-4); the second bearings (2-4) are arranged on both sides of the middle of the eccentric shaft (2-2); the roller (3) is connected to the eccentric shaft (2-2) through the second bearings (2-4); the first bearing (2-3) is arranged on the eccentric shaft (2-2) outside the second bearing (2-4); the first flywheel (2-1) is arranged at one end of the eccentric shaft (2-2), and the second flywheel (2-5) is arranged at the other end of the eccentric shaft (2-2).

3. An extrusion crusher according to claim 1, characterized in that The rotary shaft (2) is provided with a bearing seat plate (2-31), the bearing seat plate (2-31) is installed on the eccentric shaft (2-2) on the rotary shaft (2) through a first bearing (2-3) on the rotary shaft (2), and the bearing seat plate (2-31) is provided with a pin hole (2-32) and a threaded hole (2-33).

4. The extrusion crusher according to claim 1, characterized in that The frame (1) comprises a first side plate (1-1) and a second side plate (1-2); the upper portion of the first side plate (1-1) is connected to the upper portion of the second side plate (1-2) via a connecting beam (1-3); the inner sides of the front portions of the first side plate (1-1) and the second side plate (1-2) are bottom plates (1-31); the outer sides of the bottom plates (1-31) are auxiliary plates (1-32); the bottom plates (1-31) are provided with light holes (1-34) corresponding to threaded holes (2-33) on the bearing seat plates (2-31) on the rotary shaft (2); the auxiliary plates (1-32) are provided with pin holes (1-33) corresponding to the pin holes (2-32); and the bearing seat plates (2-31) are arranged between the bottom plates (1-31) and the auxiliary plates (1-32).

5. An extrusion crusher according to claim 4, characterized in that A first connecting section (1-11) is provided on the upper portion of the first side plate (1-1), a second connecting section (1-12) is provided on the upper portion of the second side plate (1-2), and holes (1-13) adapted to the end cylinder (6-1) of the rotating shaft (6) are provided on the first connecting section (1-11) and the second connecting section (1-12).

6. An extrusion crusher according to claim 5, characterized in that The bolt connection holes between the first connecting section (1-11) and the second connecting section (1-12) and the side plate of the frame (1) are long holes; the lower end surfaces of the first connecting section (1-11) and the second connecting section (1-12) and the upper end surface of the plate of the side frame (1) are connected via a bolt assembly (1-17); and a gasket (1-16) is provided between the lower end surfaces of the first connecting section (1-11) and the second connecting section (1-12) and the upper end surface of the side plate of the frame (1).

7. The extrusion crusher according to claim 1, characterized in that An upper wear-resistant lining plate (4-2) is arranged on the inner side of the upper rotating body (4), a lower wear-resistant lining plate (5-2) is arranged on the inner side of the lower rotating body (5), and a roller wear-resistant lining plate (3-1) is arranged on the roller (3).

8. The extrusion crusher according to claim 1, characterized in that An upper rotating body hole (4-3) is provided at the lower end of the upper rotating body (4) corresponding to the middle cylinder (6-2) of the rotating shaft (6); an upper wear-resistant lining plate (4-2) on the upper rotating body (4) is connected to the upper rotating body (4) via an upper bolt assembly (4-4); A lower rotating body hole (5-1) is provided at the upper end of the lower rotating body (5) corresponding to the middle cylinder (6-2) of the rotating shaft (6); a lower wear-resistant lining plate (5-2) on the lower rotating body (5) is connected to the lower rotating body (5) via a lower bolt assembly (5-3).

9. The extrusion crusher according to claim 1, characterized in that The upper end of the connecting rod (7) is provided with an upper connecting rod hole (7-2) corresponding to the extension sections (4-1) on both sides of the upper end of the upper rotating body (4); the lower end of the connecting rod (7) is provided with a lower connecting rod hole (7-1) corresponding to the frame hole (1-18) at the front upper end of the frame (1).

10. The extrusion crusher according to claim 1, characterized in that The adjusting device (8) comprises a rotating shaft (8-1), a pressure rod (8-2) and an adjusting rod (8-3); a rotating shaft hole (8-13) arranged in the rotating shaft (8-1) is adapted to a side plate hole (1-14) arranged on the rear part of the side plate of the frame (1); and a pin is inserted into the rotating shaft hole (8-13) and the side plate hole (1-14); A rear convex arm (8-12) is arranged at the rear side of the rotating shaft (8-1), a lower convex arm (8-11) is arranged at the lower end of the rotating shaft (8-1), the rear end of the pressure rod (8-2) is hinged to the lower convex arm (8-11) via a pin, the front end of the pressure rod (8-2) is hinged to the lower rotating body lower hole (5-4) at the lower part of the lower rotating body (5) via a pin; the lower end of the adjusting rod (8-3) is hinged to the rear convex arm (8-12) via a pin, and the upper end of the adjusting rod (8-3) is hinged to a hinge hole (1-15) arranged at the rear end of the frame (1) via a pin.

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