A pair of roller sand making machine with energy-saving roller assembly

Abstract

The application discloses a pair-roller sand making machine with an energy-saving grinding roller assembly, which comprises a main frame, a crushing mechanism, a displacement mechanism, a driving mechanism and a cooling mechanism; the pair-roller sand making machine is cooled by water-based coolant, so that the crushing roller of the pair-roller sand making machine is not high in temperature during the crushing process of rocks, the water-based coolant is high in specific heat and good in cooling efficiency, the motor is low in power consumption, and the hidden danger that the crushing roller slips in the circumferential direction of the transmission roller due to the temperature inconsistency of the transmission roller and the crushing roller caused by poor cooling is eliminated; the motor support is directly connected with an external maintenance-free speed reducer assembly for driving, the transmission efficiency is high, interchangeability is good, the cost is low, and oil seepage is avoided; the axial expansion sleeve and the radial expansion sleeve are arranged on the shaft in the axial direction and the radial direction respectively, so that the crushing roller is reliably connected, the transmission torque is large, the reliability is high, and the crushing roller is convenient to install and replace.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining machinery equipment, in particular to a pair of roll sand making machine with an energy-saving grinding roller assembly. BACKGROUND

[0002] The machine-made sand and stone industry has become an important basic industry in China, playing an important supporting role in national infrastructure. With the gradual depletion of natural sand resources and the urgent need for environmental protection, it has become an industry trend to replace natural sand with machine-made sand under the premise of prohibiting the excavation of natural sand in rivers and lakes. Currently, machine-made sand is widely used. Machine-made sand is derived from rock, and small particles with a particle size of less than 4.75 mm produced by crushing and screening rock with mining equipment are called machine-made sand. Due to the harsh working conditions of rock crushing, the requirements for crushing equipment are becoming higher and higher.

[0003] Crushing sand making machinery refers to a machine that converts the kinetic energy of the equipment into the crushing work of minerals. It is a professional mechanical equipment, mainly including jaw crushers, cone crushers, and roller crushers. Among them, the roller crusher is a reliable and easy-to-use machine with low energy consumption, high finished product rate after crushing, uniform rock particle size, reasonable grade matching, excellent particle shape, and low over-crushing rate. It is one of the most popular mining equipment in the machine-made sand industry. Due to the intense friction between the surface of the crushing roller and the rock during the crushing process of the pair of roll sand making machine, friction generates heat, which can cause high temperatures. Therefore, the crushing roller needs to be cooled to reduce its surface temperature.

[0004] The existing ordinary pair of roll sand making machine, such as the pair of roll crusher with fixed shaft bearing structure grinding roller disclosed in the patent document with publication number CN112473818B, includes a crusher frame, a fixed roller part and a movable roller part are provided on the crusher frame, a crushing discharge port is formed between the fixed roller part and the movable roller part, a drive member is provided on the crusher frame, the fixed roller part and the movable roller part are connected to the drive member, a discharge port adjusting assembly and an iron adjusting member are also provided on the crusher frame, the discharge port adjusting assembly is connected to the movable roller part, the movable roller part can move reciprocally and linearly towards or away from one end of the fixed roller part, and the iron adjusting member is connected to the fixed roller part.

[0005] Although the pair of roll crusher with fixed shaft bearing structure grinding roller can solve the corresponding technical problems, it has a precision reduction mechanism built into the grinding roller assembly, which requires lubricating oil for lubrication and cooling, and a separate external lubricating oil supply system (such as a lubricating oil tank, a lubricating oil pump, a lubricating oil pipeline, etc.) needs to be added. Figure 4The inside cooling lubricating oil of the broken roller is supplied by an oil pump through a lubricating oil pipe, and the pressure oil of the hydraulic oil cylinder is supplied by an oil pump through a hydraulic oil pipe. The common type of the pair roller sand making machine has the following problems: 1. the lubricating oil pump motor has high power consumption; 2. the lubricating oil has low specific heat, and has the defect of poor cooling effect, the broken roller inner cavity sealing element needs to be maintained frequently, and the lubricating oil is easy to leak after aging, polluting the environment; 3. the broken roller has a built-in precision reduction mechanism, and the user maintenance requirement is high.

[0006] Therefore, we propose a pair roller sand making machine with an energy-saving type of grinding roller assembly. SUMMARY

[0007] The purpose of the present application is to provide a pair roller sand making machine with an energy-saving type of grinding roller assembly to solve the technical problems of the existing common type of pair roller sand making machine, such as high power consumption of the lubricating oil pump motor, low specific heat of the lubricating oil, poor oil cooling effect, oil leakage of the broken roller inner cavity sealing element after aging, environmental pollution, high user maintenance requirement of the built-in precision reduction mechanism of the broken roller, and the like.

[0008] To achieve the above purpose, the present application adopts the following technical scheme:

[0009] A pair roller sand making machine with an energy-saving type of grinding roller assembly comprises:

[0010] A main frame for forming the installation base of the pair roller sand making machine;

[0011] A broken mechanism for realizing rock breaking operation, wherein the broken mechanism comprises a fixed broken grinding roller assembly installed on the top of the main frame, and the top of the main frame is also movably installed with a movable broken grinding roller assembly used in cooperation with the fixed broken grinding roller assembly, and the fixed broken grinding roller assembly and the movable broken grinding roller assembly have the same structure;

[0012] A displacement mechanism for realizing the linear motion of the movable broken grinding roller assembly away from or close to the fixed broken grinding roller assembly, and the displacement mechanism is arranged on the main frame;

[0013] A driving mechanism for driving the fixed broken grinding roller assembly and the movable broken grinding roller assembly to rotate towards each other, and the driving mechanism is provided with two on the main frame, and the two driving mechanisms are respectively used in cooperation with the fixed broken grinding roller assembly and the movable broken grinding roller assembly through belt transmission;

[0014] Cooling mechanism for reducing surface temperature of fixed crushing roller assembly and movable crushing roller assembly during crushing of rocks, and the cooling mechanism comprises a water tank, a liquid outlet of a water pump in the water tank is communicated with two first connecting pipes through a three-way pipe, two second connecting pipes are communicated with the water tank, water inlet pipes are communicated between the fixed crushing roller assembly and the movable crushing roller assembly respectively through the two first connecting pipes, and water outlet pipes are communicated between the fixed crushing roller assembly and the movable crushing roller assembly respectively through the two second connecting pipes.

[0015] As a further scheme of the application, a crushing box for concentrating rocks is mounted on the top of the main frame, the fixed crushing roller assembly and the movable crushing roller assembly are located in the inner cavity of the crushing box, a feeding hopper is communicated with the top of the crushing box, and a discharging pipe is communicated with the bottom of the crushing box.

[0016] As a further scheme of the application, the displacement mechanism comprises a connecting support mounted on the main frame, a sliding support is arranged between the main frame and the movable crushing roller assembly, the sliding support is slidingly connected to the top of the main frame, the movable crushing roller assembly is arranged on the sliding support, a hydraulic oil cylinder for driving the sliding support to move horizontally along the length direction of the connecting support is mounted on the connecting support, and the output end of the hydraulic oil cylinder is fixedly connected with the sliding support.

[0017] As a further scheme of the application, an oil tank is fixedly connected to one side of the water tank, a hydraulic oil inlet pipe is communicated between the oil inlet end of the hydraulic oil cylinder and the oil outlet of an oil pump in the oil tank, and a hydraulic oil return pipe is communicated between the oil outlet end of the hydraulic oil cylinder and the oil tank.

[0018] As a further scheme of the application, valves are mounted on the hydraulic oil inlet pipe, the hydraulic oil return pipe, the water inlet pipe and the water outlet pipe.

[0019] As a further scheme of the application, the driving mechanism comprises motor supports, two motor supports are mounted on the top of the main frame and the sliding support respectively, motors are mounted on the top of the motor supports, external maintenance-free reduction assemblies are mounted on the output shafts of the motors, one external maintenance-free reduction assembly is connected in transmission with the fixed crushing roller assembly through belt and belt pulley cooperation, and the other external maintenance-free reduction assembly is connected in transmission with the movable crushing roller assembly through belt and belt pulley cooperation.

[0020] As a further scheme of the application, auxiliary supports for improving the operation stability of the external maintenance-free reduction assemblies are mounted on the top of the main frame and the sliding support respectively.

[0021] As a further scheme of the present application, the fixed crushing roller assembly and the movable crushing roller assembly each comprises a hollow spindle, both ends of the surface of the spindle are provided with a bearing, the outer ring of the bearing is provided with a bearing seat, the top of the main frame and the sliding support are respectively fixedly connected with the corresponding bearing seat, the surface of the spindle is provided with a transmission roller, two axial expansion sleeves are symmetrically arranged between the transmission roller and the spindle, radial expansion sleeves are arranged on both sides of the inner wall surface of the transmission roller, the inner wall surface of the radial expansion sleeve is arranged on the surface of the spindle, the outer surface of the transmission roller is provided with a crushing roller, and a taper sleeve for locking the crushing roller is arranged on the side of the transmission roller away from the belt pulley.

[0022] As a further scheme of the present application, the end of the spindle away from the belt pulley is communicated with a water inlet end and a water outlet end through a shaft seal, the port of the water inlet end is communicated with the end of the corresponding water inlet pipe, and the port of the water outlet end is communicated with the end of the corresponding water outlet pipe.

[0023] As a further scheme of the present application, O-shaped sealing rings are arranged between the outer surface of the transmission roller and the inner wall surface of the crushing roller and between the inner wall surface of the transmission roller and the outer surface of the spindle.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The water tank, water inlet pipe, water outlet pipe, water inlet end, spindle and water outlet end are used in cooperation, the water-based cooling crushing roller is adopted, the crushing roller of the roller-type sand making machine can not be high-temperature during crushing rocks, the water-based coolant has high specific heat and good cooling efficiency, the motor has low power consumption, and the hidden danger that the crushing roller slips relative to the circumferential direction of the transmission roller due to inconsistent temperatures of the transmission roller and the crushing roller caused by poor cooling can be eliminated;

[0026] 2. The motor support is externally provided with a maintenance-free reduction assembly directly connected for driving, the transmission efficiency is high, the externally provided maintenance-free reduction assembly has the advantages of good interchangeability, low cost and no oil leakage;

[0027] 3. The axial expansion sleeve and the radial expansion sleeve are respectively arranged in the axial direction and the radial direction, the crushing roller connection is reliable, the transmission torque is large, the reliability is high, and the installation and replacement are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 Structure schematic diagram of an embodiment of the present application;

[0030] Figure 2 Structure schematic diagram of a side view of a moving crushing roller assembly in an embodiment of the present application;

[0031] Figure 3 Structure schematic diagram of a side view of a moving crushing roller assembly in an embodiment of the present application; Figure 2 Structure schematic diagram of a cross-sectional view in A-A direction in an embodiment of the present application;

[0032] Figure 4 Structure schematic diagram of a prior art roller crusher.

[0033] Reference signs: 1, main frame; 2, fixed crushing roller assembly; 3, moving crushing roller assembly; 310, main shaft; 311, bearing; 312, bearing seat; 313, transmission roller; 314, axial expansion sleeve; 315, radial expansion sleeve; 316, crushing roller; 317, taper sleeve; 318, O-shaped sealing ring; 319, water inlet end; 320, water outlet end; 321, sealing retainer ring; 322, through hole; 4, crushing box; 5, motor support; 6, motor; 7, external maintenance-free reduction assembly; 8, connecting bracket; 9, sliding bracket; 10, hydraulic oil cylinder; 11, oil tank; 12, hydraulic oil inlet pipe; 13, hydraulic oil return pipe; 14, water tank; 15, water inlet pipe; 16, water outlet pipe; 17, auxiliary support; 18, lubricating oil return pipe; 19, lubricating oil inlet pipe. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear and understandable, the embodiments of the present application are further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0035] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0037] Example 1:

[0038] like Figures 1-3 As shown, an embodiment of the present invention provides a double-roll sand making machine with an energy-saving grinding roller assembly, comprising a main frame 1, a crushing mechanism, a displacement mechanism, a driving mechanism, and a cooling mechanism.

[0039] The main frame 1 is used to form the installation foundation of the double-roll sand making machine; the crushing mechanism is used to realize the rock crushing operation, and the crushing mechanism includes a fixed crushing roller assembly 2 fixedly installed on the top of the main frame 1, and a movable crushing roller assembly 3 that works with the fixed crushing roller assembly 2 is also movably installed on the top of the main frame 1. The fixed crushing roller assembly 2 and the movable crushing roller assembly 3 have the same structure.

[0040] The displacement mechanism is used to realize the linear movement of the moving crushing roller assembly 3 away from or close to the fixed crushing roller assembly 2, and the displacement mechanism is located on the main frame 1; the drive mechanism is used to drive the fixed crushing roller assembly 2 and the moving crushing roller assembly 3 to rotate in opposite directions, and there are two drive mechanisms on the main frame 1, which are used in conjunction with the fixed crushing roller assembly 2 and the moving crushing roller assembly 3 respectively.

[0041] The cooling mechanism is used to reduce the surface temperature of the stationary crushing roller assembly 2 and the moving crushing roller assembly 3 during the crushing of rocks. The cooling mechanism includes a water tank 14. The outlet of the water pump in the water tank 14 is connected to two first connecting pipes through a three-way pipe. The oil tank 11 is connected to two second connecting pipes. The two first connecting pipes are respectively connected to the stationary crushing roller assembly 2 and the moving crushing roller assembly 3 by water inlet pipes 15. The two second connecting pipes are respectively connected to the stationary crushing roller assembly 2 and the moving crushing roller assembly 3 by water outlet pipes 16.

[0042] Example 2:

[0043] like Figure 1 As shown, a crushing box 4 for concentrating rocks is installed on the top of the main frame 1. The fixed crushing roller assembly 2 and the moving crushing roller assembly 3 are both located in the inner cavity of the crushing box 4. The top of the crushing box 4 is connected to the feed hopper, and the bottom of the crushing box 4 is connected to the discharge pipe. The crushing box 4 prevents the phenomenon of stone fragments splashing during the rock crushing process, which helps to improve the safety of the double roller sand making machine.

[0044] The displacement mechanism includes a connecting bracket 8 mounted on the main frame 1. A sliding bracket 9 is provided between the main frame 1 and the moving crushing roller assembly 3. The sliding bracket 9 is slidably connected to the top of the main frame 1. The moving crushing roller assembly 3 is mounted on the sliding bracket 9. A hydraulic cylinder 10 is installed on the connecting bracket 8 to drive the sliding bracket 9 to move horizontally along the length of the connecting bracket 8. The output end of the hydraulic cylinder 10 is fixedly connected to the sliding bracket 9. Activating the hydraulic cylinder 10 can adjust the gap between the fixed crushing roller assembly 2 and the moving crushing roller assembly 3, thereby controlling the particle size of the discharged rock. At the same time, when encountering excessively hard or uncrushable materials, the moving crushing roller assembly 3 can be retracted by the hydraulic cylinder 10, increasing the gap between the fixed crushing roller assembly 2 and the moving crushing roller assembly 3. The excessively hard or uncrushable materials fall through the discharge pipe, thus protecting the pair of crushing rollers from damage.

[0045] A water tank 14 is fixedly connected to an oil tank 11 on one side. A hydraulic inlet pipe 12 connects the oil inlet end of the hydraulic cylinder 10 to the oil outlet of the oil pump in the oil tank 11. A hydraulic return pipe 13 connects the oil outlet end of the hydraulic cylinder 10 to the oil tank 11. A dynamic circulation loop of hydraulic oil is formed between the oil tank 11, the oil pump, the hydraulic inlet pipe 12, the hydraulic cylinder 10, and the hydraulic return pipe 13. This allows the oil tank 11 to not only store oil but also to dissipate heat, separate air bubbles in the oil, eliminate foam, and settle impurities. Valves are installed on the hydraulic inlet pipe 12, the hydraulic return pipe 13, the water inlet pipe 15, and the water outlet pipe 16.

[0046] The drive mechanism includes a motor support 5, with two motor supports 5 respectively mounted on the top of the main frame 1 and the sliding bracket 9. A motor 6 is mounted on the top of the motor support 5, and an external maintenance-free reduction assembly 7 is mounted on the output shaft of the motor 6. One of the external maintenance-free reduction assemblies 7 is connected to the fixed crushing roller assembly 2 via a belt and pulley, and the other external maintenance-free reduction assembly 7 is connected to the moving crushing roller assembly 3 via a belt and pulley. By starting the motor 6, the fixed crushing roller assembly 2 and the moving crushing roller assembly 3 can be driven to rotate in opposite directions to realize rock crushing operation.

[0047] The top of the main frame 1 and the sliding bracket 9 are respectively equipped with auxiliary support brackets 17 to improve the operational stability of the external maintenance-free reduction assembly 7.

[0048] like Figure 2 , 3As shown, both the fixed crushing roller assembly 2 and the moving crushing roller assembly 3 include a hollow main shaft 310. A bearing 311 is installed at both ends of the surface of the main shaft 310. A bearing seat 312 is installed on the outer ring of the bearing 311. The tops of the main frame 1 and the sliding bracket 9 are fixedly connected to the corresponding bearing seats 312. A transmission roller 313 is sleeved on the surface of the main shaft 310. Two axial tension sleeves 314 are symmetrically installed between the transmission roller 313 and the main shaft 310. Radial tension sleeves 315 are installed on both sides of the inner wall of the transmission roller 313. The inner wall of the radial tension sleeves 315 is installed on the surface of the main shaft 310. A crushing roller 316 is sleeved on the outer surface of the transmission roller 313. A tapered sleeve 317 for locking the crushing roller 316 is installed on the side of the transmission roller 313 away from the pulley by an internal hexagon screw.

[0049] like Figure 3 As shown, the end of the main shaft 310 away from the pulley is connected to a water inlet 319 and a water outlet 320 through a sealed shaft. The port of the water inlet 319 is connected to the end of the corresponding water inlet pipe 15, and the port of the water outlet 320 is connected to the end of the corresponding water outlet pipe 16. A dynamic circulation loop of water-based coolant is formed between the water tank 14, the water inlet pipe 15, the water inlet 319, the main shaft 310, the crushing roller 316, the water outlet 320, and the water outlet pipe 16, so that the crushing roller 316 can be cooled by internally circulating water-based coolant.

[0050] O-rings 318 are embedded between the outer surface of the transmission roller 313 and the inner wall of the crushing roller 316, and between the inner wall of the transmission roller 313 and the outer surface of the main shaft 310. This effectively improves the sealing between the transmission roller 313 and the support of the crushing roller 316, and between the transmission roller 313 and the main shaft 310, preventing leakage.

[0051] Working principle of the invention:

[0052] Crushing operation: Start motor 6. The output shaft of motor 6 drives the corresponding main shaft 310 to rotate through the external maintenance-free reduction assembly 7, pulley and belt. The main shaft 310 drives the transmission roller 313, cone sleeve 317 and crushing roller 316 to rotate through the axial tension sleeve 314 and radial tension sleeve 315. This drives the fixed crushing roller assembly 2 and the moving crushing roller assembly 3 to rotate, so as to realize the crushing operation of the rock in the crushing box 4.

[0053] Cooling operation: Start the water pump inside the water tank 14 to draw water-based coolant from the water tank 14, so that the water-based coolant is delivered to the corresponding liquid inlet chamber of the main shaft 310 through the two water inlet pipes 15 and the water inlet end 319. The water-based coolant can then enter the lower part of the inner cavity of the crushing roller 316 through the corresponding through hole 322 for cooling. After cooling, the water-based coolant enters the return liquid chamber through the corresponding through hole 322, and finally flows back to the inner cavity of the water tank 14 through the water outlet end 320 and the water outlet pipe 16.

[0054] In summary, this invention, through the coordinated use of water tank 14, water inlet pipe 15, water outlet pipe 16, water inlet end 319, main shaft 310, and water outlet end 320, employs water-based cooling for the crushing roller 316. This ensures that the crushing roller of the double-roll sand making machine does not reach high temperatures during rock crushing. The water-based coolant has a high specific heat, good cooling efficiency, and low motor power consumption. At the same time, it eliminates the potential risk of uneven temperatures between the transmission roller 313 and the crushing roller 316 due to poor cooling, which could lead to slippage of the crushing roller 316 relative to the transmission roller 313 in the circumferential direction.

[0055] The motor support 5 is directly driven by the external maintenance-free reduction assembly 7, which has high transmission efficiency. The external maintenance-free reduction assembly 7 has the advantages of good interchangeability, low cost and no oil leakage.

[0056] The use of axial tensioning sleeves 314 and radial tensioning sleeves 315 in the axial and radial directions respectively ensures reliable connection of the crushing roller 316, high torque transmission, high reliability, and convenient installation and replacement.

[0057] The above description illustrates the basic principles of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The above embodiments and descriptions in the specification are only for illustrating the principles of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-roll sand making machine equipped with an energy-saving grinding roller assembly, characterized in that... include: The main frame (1) is used to form the mounting base of the double-roll crusher; The crushing mechanism is used to perform rock crushing operations. The crushing mechanism includes a fixed crushing roller assembly (2) fixedly installed on the top of the main frame (1). A movable crushing roller assembly (3) that works in conjunction with the fixed crushing roller assembly (2) is also movably installed on the top of the main frame (1). The fixed crushing roller assembly (2) and the movable crushing roller assembly (3) have the same structure. The displacement mechanism is used to enable the moving crushing roller assembly (3) to make linear movements away from or close to the fixed crushing roller assembly (2), and the displacement mechanism is mounted on the main frame (1). The drive mechanism is used to drive the fixed crushing roller assembly (2) and the moving crushing roller assembly (3) to rotate in opposite directions. Two drive mechanisms are provided on the main frame (1). The two drive mechanisms are used in cooperation with the fixed crushing roller assembly (2) and the moving crushing roller assembly (3) respectively through belt drive. A cooling mechanism is used to reduce the surface temperature of the fixed crushing roller assembly (2) and the moving crushing roller assembly (3) during rock crushing. The cooling mechanism includes a water tank (14). The outlet of the water pump in the water tank (14) is connected to two first pipes through a three-way pipe. Two second pipes are connected to the water tank (14). The two first pipes are respectively connected to the fixed crushing roller assembly (2) and the moving crushing roller assembly (3) with water inlet pipes (15). The two second pipes are respectively connected to the fixed crushing roller assembly (2) and the moving crushing roller assembly (3) with water outlet pipes (16). Both the fixed crushing roller assembly (2) and the moving crushing roller assembly (3) include a hollow main shaft (310). A bearing (311) is mounted at both ends of the main shaft (310). A bearing seat (312) is mounted on the outer ring of each bearing (311). The tops of the main frame (1) and the sliding bracket (9) are fixedly connected to the corresponding bearing seats (312). A transmission roller (313) is sleeved on the surface of the main shaft (310). 3) Two axial tensioning sleeves (314) are symmetrically installed between the main shaft (310). Radial tensioning sleeves (315) are installed on both sides of the inner wall of the transmission roller (313). The inner wall of the radial tensioning sleeves (315) is installed on the surface of the main shaft (310). A crushing roller (316) is sleeved on the outer surface of the transmission roller (313). A tapered sleeve (317) for locking the crushing roller (316) is installed on the side of the transmission roller (313) away from the pulley. The main shaft (310) has an inlet (319) and an outlet (320) connected by a sealing shaft at one end away from the pulley. The port of the inlet (319) is connected to the end of the corresponding inlet pipe (15), and the port of the outlet (320) is connected to the end of the corresponding outlet pipe (16). A sealing ring (321) is installed inside the main shaft (310), which divides the inner cavity of the main shaft (310) into an inlet chamber and a return chamber. One end of the water end (319) is connected to the liquid inlet chamber, and one end of the water outlet end (320) is connected to one end of the liquid return chamber. The surface of the main shaft (310) is provided with multiple through holes (322) that are equidistant from each other in a circular shape along its axial direction and are connected to the liquid inlet chamber and the liquid return chamber. O-rings (318) are embedded between the outer surface of the transmission roller (313) and the inner wall of the crushing roller (316), and between the inner wall of the transmission roller (313) and the outer surface of the main shaft (310).

2. A double-roll sand making machine with an energy-saving grinding roller assembly according to claim 1, characterized in that: The top of the main frame (1) is equipped with a crushing box (4) for concentrating rocks. The fixed crushing roller assembly (2) and the moving crushing roller assembly (3) are both located in the inner cavity of the crushing box (4). The top of the crushing box (4) is connected to a feed hopper, and the bottom of the crushing box (4) is connected to a discharge pipe.

3. A double-roll sand making machine with an energy-saving grinding roller assembly according to claim 2, characterized in that: The displacement mechanism includes a connecting bracket (8) mounted on the main frame (1), a sliding bracket (9) between the main frame (1) and the moving crushing roller assembly (3), the sliding bracket (9) being slidably connected to the top of the main frame (1), the moving crushing roller assembly (3) being mounted on the sliding bracket (9), and a hydraulic cylinder (10) for driving the sliding bracket (9) to move horizontally along the length direction of the connecting bracket (8) being mounted on the connecting bracket (8), the output end of the hydraulic cylinder (10) being fixedly connected to the sliding bracket (9).

4. A double-roll sand making machine with an energy-saving grinding roller assembly according to claim 3, characterized in that: An oil tank (11) is fixedly connected to one side of the water tank (14). A hydraulic inlet pipe (12) is connected between the oil inlet end of the hydraulic cylinder (10) and the oil outlet of the oil pump in the oil tank (11). A hydraulic return pipe (13) is connected between the oil outlet end of the hydraulic cylinder (10) and the oil tank (11).

5. A double-roll sand making machine with an energy-saving grinding roller assembly according to claim 4, characterized in that: Valves are installed on the hydraulic oil inlet pipe (12), hydraulic oil return pipe (13), water inlet pipe (15), and water outlet pipe (16).

6. A double-roll sand making machine with an energy-saving grinding roller assembly according to claim 5, characterized in that: The drive mechanism includes a motor support (5), two motor supports (5) are respectively installed on the top of the main frame (1) and the sliding bracket (9), a motor (6) is installed on the top of the motor support (5), and an external maintenance-free reduction assembly (7) is installed on the output shaft of the motor (6). One of the external maintenance-free reduction assemblies (7) is connected to the fixed crushing roller assembly (2) by a belt and a pulley, and the other external maintenance-free reduction assembly (7) is connected to the moving crushing roller assembly (3) by a belt and a pulley.

7. A double-roll sand making machine with an energy-saving grinding roller assembly according to claim 6, characterized in that: The top of the main frame (1) and the sliding bracket (9) are respectively equipped with auxiliary support brackets (17) for improving the operational stability of the external maintenance-free reduction assembly (7).

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