A lower frame assembly of a multi-cylinder cone crusher

Abstract

The present invention discloses a lower frame assembly of a multi-cylinder cone crusher, and its structural features are as follows: the lower frame and the main shaft are integrally cast and then machined; holes are provided on the observation window cover plate for fixing it on the lower frame; the support rods are segmented and welded in a circle on the upper end surface of the lower frame; the cushion seat is made of copper parts and is segmented and welded in a circle on the conical surface of the lower frame; the guide pin bushing is installed in the corresponding mounting hole on the upper flange surface of the lower frame through cold press interference fit to protect the lower frame and prevent the direct contact between the lower frame and the guide pin. An O-ring is installed in the lower groove of the guide pin bushing to prevent it from falling off; the setscrew seat is welded on the horizontal shaft end surface of the lower frame to realize the eccentric adjustment of the horizontal shaft assembly. The beneficial effects of the present invention are: the lower frame assembly has high strength, is simple to use, has good stability, does not require press-fitting the main shaft or cold press interference fitting the main shaft, has low requirements for assembly workers and equipment, and is relatively easy to ensure the perpendicularity between the main shaft and the horizontal shaft hole, improving the equipment performance.

Description

Technical Field

[0001] The present invention belongs to the field of ore equipment, and particularly relates to a lower frame assembly of a multi-cylinder cone crusher. Background Art

[0002] Multi-cylinder hydraulic cone crushers are widely used in the metal mining and metallurgical industries, construction industry, cement industry, sand and stone industries, etc. They play a very important role in projects such as nuclear power, highways, airports, and mines. In recent years, due to market changes and demands, both crusher users and manufacturers in China have shown strong interest in multi-cylinder hydraulic cone crushers. Multi-cylinder hydraulic cone crushers have become a very popular type in the current crusher industry.

[0003] Multi-cylinder cone crushers are quickly favored by the entire crushing industry due to their high output, good particle shape, low energy consumption, relatively stable operation, and easy implementation of automatic control. A multi-cylinder cone crusher is a typical crushing device for medium and fine crushing of hard materials. It adopts the "laminar crushing" principle to improve the primary crushing yield, with simpler and more convenient maintenance and lower operating costs. With its excellent performance, after being put on the market, multi-cylinder cone crushers have been widely used in the entire crushing industry. Its working principle is that the horizontal shaft transmission mechanism drives the eccentric mechanism, and the eccentric mechanism then drives the moving cone mechanism to perform eccentric motion. The material is squeezed between the moving cone and the fixed cone through the liners to achieve the effect of laminar crushing.

[0004] The main shaft of a multi-cylinder hydraulic cone crusher is interference-fitted and fixed on the frame. The moving cone assembly is supported by the main shaft, and the fixed cone assembly is assembled on the adjusting ring assembly. The adjusting ring is located on the lower frame and is tightened by six release cylinders to withstand the upward force brought by the material to the crusher. When assembling the main shaft and the lower frame, it is often impossible to ensure the perpendicularity between the main shaft and the horizontal shaft hole, which will directly affect the performance of the crusher. If the perpendicularity between the two is too large, a series of problems such as the sealing failure between the moving cone and the frame, the excessive inclination angle of the moving cone assembly, and abnormal wear of the copper sleeve will occur. In order to achieve the functions of convenient crushing operation, component installation, and maintenance, the lower frame assembly of the crusher is designed with various considerations. It is necessary to ensure the performance of the crusher without making processing or assembly difficult. How to design a high-quality lower frame assembly is particularly important.

[0005] At present, the frame assembly of multi-cylinder cone crusher has the following shortcomings: 1. The traditional multi-cylinder cone crusher adopts the mode of integrating the frame and the horizontal shaft seat. The small gear must be installed from the small gear cavity in the frame. The space is small and the side clearance of the large and small gears cannot be accurately adjusted; if the horizontal shaft hole is damaged, the entire frame may be scrapped; the horizontal shaft hole adopts a non-eccentric design, which makes it difficult to adjust the gear side clearance; 2. There is no barb buffer groove in the large gear cavity. When the crusher is running, the lubrication is easily thrown out from the U-shaped seal; 3. There is no foreign body cleaning hole in the oil return cavity. If there is a large foreign body that cannot be cleaned in time, the oil return will be blocked, and the lubricating oil will be thrown out from the U-shaped seal. Overflow; 4. No observation hole and observation cover are set, so the crushing chamber cannot be observed, and the wear of the vulnerable parts in the crusher cannot be understood. The frame liner, rib liner, and moving cone liner are prone to wear and tear; 5. The main shaft and the lower frame are assembled with interference fit, which requires high labor or equipment during assembly. Cold installation or installation of the main shaft by a hydraulic press can easily cause the main shaft and the horizontal shaft hole to be not perpendicular, greatly reducing the performance of the crusher; 6. No seat cushion is set or the seat cushion is set with a waist-shaped hole. When the crusher ring jumps, the friction between the adjustment ring and the lower frame causes both to wear; the lack of a waist-shaped hole makes the welding unstable and the seat cushion easily falls off; Summary of the invention

[0006] The object of the present invention is to provide a multi-cylinder cone crusher lower frame assembly, which is applied to the multi-cylinder cone crusher. The lower frame assembly has high strength, is easy to use, has good stability, does not require press-fitting of the main shaft or interference cold-fitting of the main shaft, has low requirements for assembly workers and equipment, and is relatively easy to ensure that the main shaft is perpendicular to the horizontal shaft hole, thereby improving equipment performance.

[0007] The technical solution adopted by the present invention is as follows: A lower frame assembly of a multi-cylinder cone crusher, comprising a lower frame, an observation window cover plate, a support rod, a cushion, a guide pin bushing, an O-ring, a setscrew seat, a frame ring, an oil return flange, a plug, a frame liner, a rib liner, a lower thrust bearing, a spindle bushing, a flat key, a U-shaped sealing ring; the lower frame is integrally cast with the spindle and then machined; holes are provided on the observation window cover plate for fixing it on the lower frame; the support rod is segmented and welded in a circle on the upper end surface of the lower frame; the cushion is made of copper and is segmented and welded in a circle on the conical surface of the lower frame; the guide pin bushing is installed in the corresponding mounting hole on the upper flange surface of the lower frame by cold press interference fit to protect the frame and prevent direct contact between the lower frame and the guide pin. An O-ring is installed in the lower groove of the guide pin bushing to prevent it from falling off; the setscrew seat is welded on the horizontal shaft end surface of the lower frame to achieve eccentric adjustment of the horizontal shaft assembly; the oil return flange is welded on the oil return port of the oil return cavity of the lower frame; the plug has a thread and is installed in the cleaning hole on the side of the oil return cavity of the lower frame. When the oil return cavity is blocked by foreign objects, the plug is opened for cleaning; the frame liner is welded on the inner surface of the entire circle of the lower frame to prevent the lower frame from being impacted and worn by materials; the rib liner straddles the connecting rib of the lower frame through an opening, and both sides of the opening are welded to the connecting rib through two fixing blocks, and its upper part is welded to the frame liner through two angle steels to protect the connecting rib; after passing through the spindle, the lower thrust bearing is seated on the lower frame and fixed by countersunk head screws; the spindle bushing is installed on the spindle of the lower frame by interference fit, a flat key is installed, and threaded holes are drilled between the contact surfaces of the spindle bushing and the spindle of the lower frame, and fixed by spindle countersunk head screws; the frame ring is installed in the mounting hole of the horizontal shaft hole by interference fit. This lower frame assembly has high strength, simple use, and good stability. There is no need to press-fit the spindle or perform interference cold installation on the spindle, with low requirements for assembly workers and equipment, and it is relatively easy to ensure the perpendicularity of the spindle and the horizontal shaft hole, improving the equipment performance.

[0008] Furthermore, the lower frame is a casting, which includes a frame body, an upper flange, an observation hole, a main shaft, a horizontal shaft hole, mounting lugs, a lower flange, the middle part of the frame, an oil return cavity, and connecting ribs; the upper flange is provided with four evenly distributed bushing holes, and the nine notches on the upper flange correspond to the nine mounting lugs at the lower part of the frame. Each mounting lug is provided with a mounting hole, and three mounting lugs are evenly distributed in a group, with a lifting lug in the middle. There are locally continuous reinforcing ribs at the connection between every three mounting lugs and the frame body; the three connecting ribs are evenly distributed to connect the frame body and the middle part of the frame; the observation hole is arranged on the frame body; an oil return cavity is arranged at the bottom of the lower frame, and the oil return cavity is connected to the pinion cavity in the middle part of the frame and extends outward in the direction of the horizontal shaft hole. An oil return hole is arranged in the direction of its horizontal shaft hole, and a cleaning hole is arranged on the left or right side of the oil return cavity. The cleaning hole is a threaded hole; the lower flange is square in shape, and protruding parts are provided at the four corners of the upper end surface. Through mounting holes Ⅰ and Ⅱ are arranged on the protruding parts, which can adapt to two installation bases. Corresponding protruding mounting surfaces are provided on the lower end surface of the flange, and the mounting surfaces are machined surfaces. Four wire passing holes are arranged on the two side edges of the square horizontal shaft hole, and the wire passing holes are located between the two convex parts.

[0009] Furthermore, the main shaft is formed by post-processing a monolithic casting integrally with the lower frame, located at the center of the frame. Axial lubricating holes and radial lubricating holes are arranged in the main shaft, both of which penetrate the main shaft. The axial lubricating hole is located at the center of the main shaft, and a threaded hole is arranged at the bottom; two symmetric key grooves are arranged on the upper end surface of the main shaft, and three threaded holes and three ejector holes are machined.

[0010] Furthermore, a U-shaped sealing groove, a large gear cavity, a pinion cavity, a mounting surface, and mounting holes are arranged in the middle part of the frame. The U-shaped sealing groove is located on the uppermost end surface of the middle part of the frame. The large gear cavity is communicated with the pinion cavity. The large gear cavity is U-shaped, with an inverted hook-shaped buffer groove arranged at one end of its tail, and the other end is vertically connected to the mounting surface; mounting holes are arranged on the mounting surface. The mounting surface is circular, concentric with the main shaft and axially perpendicular, and is located at the lowermost end of the main shaft.

[0011] Furthermore, the horizontal shaft hole is offset 10 - 30 mm to the left or right from the axis of the main shaft in the vertical direction, and a protruding welding platform, six mounting threaded holes and three disassembly positioning holes are arranged on the end surface at the outermost end of the horizontal shaft hole; a boss is arranged in the middle of the horizontal shaft hole; a mounting hole is arranged at the innermost end of the horizontal shaft hole, and the mounting hole is communicated with the pinion cavity.

[0012] Furthermore, the observation holes are arranged on the frame body and penetrate the frame body, with a total of three evenly distributed, and one of them is located directly above the horizontal shaft hole; four or six threaded holes are evenly arranged on the end surface of the observation hole.

[0013] Furthermore, the material of the guide pin bushing is copper alloy. A flange end surface is arranged at its upper part, a clamping groove is arranged at its lower part, and a guide pin hole is arranged in the middle.

[0014] Furthermore, the spindle bushing is made of alloy steel, and there are two keyways provided at the upper end.

[0015] Furthermore, a handle is provided on the observation cover plate, and mounting holes are provided on the cover plate, which correspond one by one to the threads on the end face of the observation hole of the lower frame, and are fixed to the lower frame by bolts.

[0016] Furthermore, the cushion seat is made of copper alloy, and there are multiple welded waist-shaped holes in the middle thereof. It is bent into an arc shape after blanking of a flat plate, and the shape after bending matches the conical surface on the main body of the frame.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Adopting the mode of separating the lower frame and the horizontal shaft seat, when the horizontal shaft seat is damaged, there is no need to repair or replace the frame; the small gear can be installed on the horizontal shaft assembly and then loaded into the horizontal shaft hole together with it. The horizontal shaft hole is eccentrically designed, which can better adjust the clearance between the large and small gears; 2. The large gear cavity is provided with a barb buffer groove, which can greatly reduce the lubricating oil from being thrown out from the U-shaped seal when the crusher is running; 3. The oil return cavity is provided with a foreign object cleaning hole. If a large foreign object blocks the oil return hole, the plug can be opened in time for cleaning, which will make the oil return smooth and avoid the lubricating oil from overflowing from the U-shaped seal; 4. An observation hole and an observation cover plate are provided, which can observe the situation of the crushing cavity, timely understand the wear of the vulnerable parts in the crusher, and avoid the situation that the frame lining plate, rib lining plate, and moving cone lining plate are worn through; 5. The integrated design of the main shaft and the lower frame has low requirements for manual labor or equipment during assembly. There is no need to cold-install or use a hydraulic press to install the main shaft. It is easy to ensure the perpendicularity of the main shaft and the horizontal shaft hole through processing, improving the performance of the crusher; 6. A cushion seat or a cushion seat with waist-shaped holes is provided. When the crusher has a ring jump, the friction between the adjusting ring and the lower frame is adjusted to reduce the wear between the two; the waist-shaped holes are provided to make the welding firm and the cushion seat is not easy to fall off; BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the external structure of the present invention;

[0019] Figure 2 is a schematic diagram of the internal structure of the present invention;

[0020] Figure 3 is a schematic diagram of the sectional structure of the present invention;

[0021] Figure 4 is a schematic diagram of the external view of the lower frame of the present invention;

[0022] Figure 5 is a schematic diagram of the internal view of the lower frame of the present invention;

[0023] Figure 6 is a schematic diagram of the sectional view of the lower frame of the present invention;

[0024] Figure 7Schematic diagram of the axis of the horizontal shaft hole and the main shaft in the vertical direction of the present invention;

[0025] Figure 8 Schematic diagram of local details of the present invention;

[0026] Figure 9 Schematic diagram of the guide pin bushing;

[0027] Figure 10 Schematic diagram of the seat cushion;

[0028] In the figure: 1 frame body, 2 upper flange, 3 observation hole, 4 main shaft, 5 horizontal shaft hole, 6 mounting ear, 7 lower flange, 8 middle part of the frame, 9 oil return cavity, 100 connecting rib, 11 lower frame, 12 observation window cover plate, 13 fixing bolt, 14 setscrew seat, 15 frame ring, 16, oil return flange, 17 plug, 18 rib lining plate, 19 angle steel, 20 fixing block, 21 O-ring, 22 guide pin bushing, 23 frame lining plate, 24 support rod, 25, seat cushion, 26 socket head cap screw for main shaft, 27 flat key, 28 insert bushing for main shaft, 29 socket head cap screw, 30 thrust bearing, 31 horizontal shaft assembly, 32 lead screw.

[0029] 101 upper end face, 102 tapered surface, 201 bushing hole, 202 notch, 301 observation hole end face, 302 screw hole, 401 ejecting hole, 402 keyway, 403 axial lubricating hole, 404. radial lubricating hole, 405 screw hole, 406 mounting hole, 501 shaft hole end face, 502 dismounting hole, 503 screw hole, 504 welding platform, 505 mounting hole, 506 boss, 601 mounting hole, 602 reinforcing rib, 603 lifting lug, 701 protrusion, 702 mounting hole Ⅰ, 703 mounting hole Ⅱ, 704 wire threading hole, 705 mounting surface, 801 U-shaped sealing groove, 802 large gear cavity, 803 small gear cavity, 804 mounting surface, 805 mounting hole, 806 buffer groove; 901 cleaning hole, 902 oil return port; 2201 flange end face, 2202 clamping groove, 2203 guide pin hole; 2501 kidney-shaped hole, 2502 inner arc surface, 2503 outer arc surface. Detailed implementation mode

[0030] Refer to Figures 1-3, a lower frame assembly of a multi-cylinder cone crusher, including a lower frame 11, an observation window cover plate 12, a support rod 24, a cushion 25, a guide pin bushing 22, an O-ring 21, a setscrew seat 14, a frame ring 15, an oil return flange 16, a plug 17, a frame liner 23, a rib liner 18, a thrust bearing 30, a spindle bushing 28, and a flat key 27; the lower frame 11 is integrally cast with the spindle 4 and then machined; the observation window cover plate 12 is provided with holes for fixing it on the lower frame 11; the support rod 24 is segmented and welded in a circle on the upper end face 101 of the lower frame; the cushion 25 is a copper part and is segmented and welded in a circle on the conical surface 102 of the lower frame; the guide pin bushing 22 is installed in the corresponding bushing hole 201 on the upper flange 2 of the lower frame 11 by cold fitting with interference fit, and an O-ring 21 is installed at the lower end card slot 2203 of the guide pin bushing 22 to prevent the guide pin bushing 22 from falling off; the setscrew seat 14 is welded on the horizontal shaft end face 501 of the lower frame; the oil return flange 16 is welded on the oil return port 902 on the oil return cavity 9 of the lower frame; the plug 17 has a thread and is installed in the cleaning hole 901 on the side of the oil return cavity of the lower frame; the frame liner 23 is welded on the entire inner surface of the lower frame 11; the rib liner 18 straddles the connecting rib 100 of the lower frame through an opening, and both sides of the opening are welded to the connecting rib 100 through two fixing blocks 20, and its upper part is welded to the frame liner 23 through two angle steels 19; after passing through the spindle, the thrust bearing 30 is seated on the lower frame 11 and fixed by a countersunk screw 29; the spindle bushing 28 is installed on the spindle of the lower frame by interference fit, a flat key 27 is installed corresponding to the keyway, and a threaded hole 405 is drilled between the contact surfaces of the spindle bushing 28 and the spindle 4 of the lower frame and fixed by a spindle countersunk screw 26; the frame ring 13 is installed in the installation hole 505 of the horizontal shaft hole 5 by interference fit.

[0031] Refer to Figures 4-6, the lower frame 11 is a casting. The lower frame includes a frame body 1, an upper flange 2, an observation hole 3, a main shaft 4, a horizontal shaft hole 5, mounting lugs 6, a lower flange 7, the middle part of the frame 8, an oil return cavity 9, and connecting ribs 100. The upper flange 2 is provided with four evenly distributed bushing holes 201. The nine notches 202 on the upper flange 2 correspond to the nine mounting lugs 6 at the lower part of the frame. Each mounting lug 6 is provided with a mounting hole 601. The mounting lugs 6 are evenly distributed in groups of three. Among them, the middle one is provided with a lifting lug 603. There are locally continuous reinforcing ribs 602 at the connection of every three mounting lugs and the frame body. The three connecting ribs 100 are circumferentially distributed to connect the frame body 1 and the middle part of the frame 8. The observation hole 3 is arranged on the frame body. An oil return cavity 9 is provided at the bottom of the lower frame. The oil return cavity 9 is connected to the pinion cavity 803 of the middle part of the frame 8 and extends outward in the direction of the horizontal shaft hole 5. An oil return port 902 is provided in the direction of its horizontal shaft hole. A cleaning hole 901 is arranged on the left or right side of the oil return cavity 9. The cleaning hole 901 is a threaded hole. The lower flange 7 is square in shape. Four protruding parts 701 are provided at the four corners of the upper end face. Through mounting holes Ⅰ702 and mounting holes Ⅱ703 are provided on the protruding parts 701, which can adapt to two installation bases. Corresponding to the lower end face of the flange, there are four corresponding protruding mounting surfaces 705 which are machined surfaces. Four wire passing holes 704 are provided on the two side edges of the square horizontal shaft hole and are located between the two protruding parts 701.

[0032] Reference Figures 3-6 , the main shaft 4 is formed by post-processing a monolithic casting integrated with the lower frame. It is located at the exact center of the lower frame. The main shaft 4 is provided with an axial lubricating hole 403 and a radial lubricating hole 404, both of which penetrate the main shaft 4. The axial lubricating hole 403 is located at the center of the main shaft, and a threaded hole 405 is provided at the bottom. Two symmetric key grooves 402 are provided on the upper end face of the main shaft, and three threaded holes 406 and three ejector holes 401 are machined.

[0033] Reference Figures 3-6 , the middle part of the frame 8 is provided with a U-shaped sealing groove 801, a large gear cavity 802, a pinion cavity 803, a mounting surface 804, and a mounting hole 805. The U-shaped sealing groove 801 is located on the uppermost end face of the middle part of the frame 8. The large gear cavity 802 is communicated with the pinion cavity 803. The large gear cavity 802 is U-shaped. A barb-shaped buffer groove 806 is provided at one end of its tail, and the other end is vertically connected to the mounting surface 804. Mounting holes 805 are provided on the mounting surface 804. The mounting surface 804 is circular, concentric with the main shaft 4 and axially perpendicular, and is located at the lowermost end of the main shaft.

[0034] Reference Figures 3-8, the horizontal shaft hole 5 is offset 10 - 30 mm to the left or right from the vertical axis of the main shaft 4, and a protruding welding platform 504, six mounting screw holes 503 and three disassembly holes 502 are provided on the shaft hole end face 501 at the outermost end of the horizontal shaft hole 5; a boss 506 is provided in the middle of the horizontal shaft hole; an installation hole 505 is provided at the innermost end of the horizontal shaft hole for installing the frame ring 15, and the installation hole 505 communicates with the pinion cavity 803; during use, after the horizontal shaft assembly 31 is installed into the horizontal shaft hole 5 of the lower frame, screwing the lead screw 32 into the setscrew seat 14 will help adjust the clearance between the large and small gears.

[0035] Reference Figures 3-6 , the observation holes 3 are provided on the frame body 1 and penetrate the frame body, with a total of three evenly distributed, and one of them is located directly above the horizontal shaft hole 5; four or six screw holes 302 are evenly provided on the observation hole end face 301.

[0036] Reference Figure 9 , the guide pin bushing 22 is made of copper alloy, with a flange end face 2201 provided at its upper part, a clamping groove 2202 provided at its lower part, and a guide pin hole 2203 in the middle.

[0037] Reference Figure 2 The main shaft bushing 28 is made of alloy steel, and two key grooves are provided at its upper end.

[0038] Reference Figure 2 , a handle is provided on the observation cover plate 12, and installation holes are provided on the cover plate, which correspond one by one to the screw holes 302 on the observation hole end face 301 of the lower frame, and are fixed to the lower frame 11 through bolts 13.

[0039] Reference Figure 10 , the cushion seat is made of copper alloy, with multiple welded waist-shaped holes 2501 provided in the middle. It is bent into an arc shape after being blanked from a flat plate, and the inner arc surface 2503 after bending matches and fits with the conical surface 102 on the frame body, and the outer arc surface 2502 is parallel to the inner arc surface 2502.

[0040] Finally, it should be noted that: the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lower frame assembly of a multi-cylinder cone crusher, comprising a lower frame, an observation window cover plate, a support rod, a guide pin bushing, an O-ring, a setscrew seat, a frame ring, an oil return flange, a plug, a frame lining plate, a rib lining plate, a lower thrust bearing, a spindle bushing, and a flat key; It is characterized in that: The lower frame includes a frame body, an upper flange, an observation hole, a spindle, a horizontal shaft hole, mounting ears, a lower flange, the middle part of the frame, an oil return cavity, and connecting ribs; the spindle and the lower frame are integrally cast and then machined, and the spindle is located at the exact center of the lower frame; holes are provided on the observation window cover plate for fixing it to the lower frame; the support rod is divided into two sections, one circle is welded to the upper end face of the lower frame; one circle is welded to the conical surface of the lower frame; the guide pin bushing is installed in the corresponding mounting hole on the upper flange surface of the lower frame by cold press interference fit; the material of the guide pin bushing is copper alloy, with a flange end face provided at the upper part, a clamping groove provided at the lower part, and a guide pin hole in the middle; an O-ring is installed in the clamping groove at the lower end of the guide pin bushing; the setscrew seat is welded to the end face of the horizontal shaft of the lower frame; the oil return flange is welded to the oil return port on the oil return cavity of the lower frame; the plug has a thread and is installed in the cleaning hole on the side of the oil return cavity of the lower frame; the frame lining plate is welded to the inner surface of the entire circle of the lower frame; the rib lining plate straddles the connecting ribs of the lower frame through an opening, and both sides of the opening are welded to the connecting ribs through two fixing blocks, and the upper part of the rib lining plate is welded to the frame lining plate through two angle steels; after the lower thrust bearing passes through the spindle, it is seated on the lower frame and fixed by countersunk head screws; the spindle bushing is installed on the spindle of the lower frame by interference fit, a flat key is installed, and threaded holes are drilled between the contact surfaces of the spindle bushing and the spindle of the lower frame, and fixed by spindle countersunk head screws; U-shaped sealing grooves, a large gear cavity, a small gear cavity, a mounting surface, and mounting holes are provided in the middle part of the frame. The U-shaped sealing groove is located on the uppermost end face of the middle part of the frame. The large gear cavity is communicated with the small gear cavity. The large gear cavity is of a U-shaped structure. One end of the large gear cavity is provided with an inverted hook-shaped buffer groove at the tail, and the other end is vertically connected to the mounting surface; mounting holes are provided on the mounting surface. The mounting surface is circular, concentric with the spindle and axially perpendicular, and is located at the lowermost end of the spindle; the horizontal shaft hole deviates 10 - 30 mm to the left or right from the axis of the spindle in the vertical direction, and a protruding welding platform, 6 mounting threaded holes and 3 disassembly positioning holes are provided on the end face of the outermost end of the horizontal shaft hole; a boss is provided in the middle of the horizontal shaft hole; a mounting hole is provided at the innermost end of the horizontal shaft hole, and the mounting hole is communicated with the small gear cavity; the frame ring is installed in the mounting hole of the horizontal shaft hole by interference fit.

2. A lower frame assembly of a multi-cylinder cone crusher according to claim 1, It is characterized in that; The nine notches on the upper flange correspond to the nine mounting lugs at the lower part of the frame. Each mounting lug is provided with a mounting hole. The mounting lugs are evenly distributed in groups of three. One of the three mounting lugs in the middle is provided with a lifting lug. There are locally continuous reinforcing ribs at the connection of every three mounting lugs and the frame body; the three connecting ribs are evenly distributed to connect the frame body and the middle part of the frame; the observation hole is arranged on the frame body; an oil return cavity is arranged at the bottom of the lower frame, and the oil return cavity is connected to the pinion cavity in the middle of the frame and extends outward in the direction of the horizontal shaft hole. An oil return hole is arranged in the direction of its horizontal shaft hole. A cleaning hole is arranged on the left or right side of the oil return cavity, and the cleaning hole is a threaded hole; the outer shape of the lower flange is square, and protruding parts are provided at the four corners of the upper end face. Through mounting holes Ⅰ and Ⅱ are arranged on the protruding parts, which can adapt to two installation bases. Corresponding to it, four protruding mounting surfaces are arranged on the lower end face of the flange, and the mounting surfaces are machined surfaces.

3. A lower frame assembly of a multi-cylinder cone crusher according to claim 2, characterized in that, Axial lubrication holes and radial lubrication holes are provided in the main shaft, both of which penetrate the main shaft. The axial lubrication hole is located at the center of the main shaft, and a threaded hole is provided at the bottom; two symmetrical key grooves are provided on the upper end face of the main shaft, and three threaded holes and three ejector holes are machined.

4. A lower frame assembly of a multi-cylinder cone crusher according to claim 2, characterized in that, The observation holes are arranged on the frame body and penetrate the frame body. There are three in total and they are evenly distributed. One of them is located directly above the horizontal shaft hole; four or six threaded holes are evenly arranged on the end face of the observation hole.

5. A lower frame assembly of a multi-cylinder cone crusher according to claim 1, characterized in that, The material of the main shaft bushing is alloy steel, and two key grooves are provided at the upper end.

6. A lower frame assembly of a multi-cylinder cone crusher according to claim 1, characterized in that, A handle is arranged on the observation window cover plate, and mounting holes are arranged on the observation window cover plate, which correspond one by one to the threads on the end face of the observation hole of the lower frame, and are fixed to the lower frame by bolts.

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