Multi-stage gravel and cement double-roller crushing and separating equipment

Abstract

The invention discloses multi-stage gravel and cement double-roller crushing and separating equipment, and belongs to the technical field of screening and separating, the multi-stage gravel and cement double-roller crushing and separating equipment comprises a double-roller crusher and screening and separating equipment arranged under a discharge port of the double-roller crusher, and the screening and separating equipment comprises a fixed frame, a vibration motor and a belt conveyor; a plurality of annular bottom brackets are connected to the interior of the fixed frame from top to bottom, a screen structure is arranged on each annular bottom bracket, and a deformation tracker is arranged below the uppermost screen structure in the fixed frame. Crushed gravel or cement falling from the discharge hole of the double-roller crusher is subjected to multi-stage screening and separating treatment through a plurality of screen structures arranged from top to bottom in the screening and separating equipment; and the sunken degree of the screen in the uppermost screen structure can be tracked and monitored through the deformation tracker, and an alarm signal can be sent out when the sunken degree of the screen exceeds a preset critical upper limit.

Description

Technical Field

[0001] The present invention relates to the field of screening and separation technology, and more specifically to a multi-stage sand and cement double-roller crushing and separation device. Background Art

[0002] With the continuous advancement of urbanization, a large number of old buildings have been demolished, generating a large amount of construction waste, a large part of which is waste cement blocks and sand and gravel generated during the demolition process. If the waste cement blocks and sand and gravel are recycled, it can not only reduce construction costs but also reduce pollution to the environment.

[0003] In demolition construction sites, small multi-stage screening and separation equipment is often used to perform multi-stage screening and separation on the sand or cement crushed by the double-roll crusher in the demolition construction site, so that sand or cement of different particle sizes can be screened out.

[0004] When separating sand, gravel or cement through the existing small-scale multi-stage screening and separation equipment, since the sand, gravel or cement have different particle sizes after being crushed by the double-roll crusher, the material falling from the discharge port of the double-roll crusher first contacts the screen located on the top layer. Since the sand, gravel or cement fragments in the falling process have large kinetic energy and impact force, they will have a large impact on the screen on the top layer. The top layer of the screen is easily loosened at its edge fixed area under the impact of the falling materials for a long time, which leads to the top layer of the screen being prone to depression that is difficult to be directly observed by the naked eye. If the depression appears on the top layer of the screen and is not discovered in time, it will cause material accumulation and cause the screening area of ​​the screen to decrease, so that most of the fallen sand, gravel or cement fragments cannot be effectively screened through the screen, which leads to a decrease in the screening efficiency of the entire multi-stage screening and separation equipment, affecting the efficiency of the double-roll crushing and separation.

[0005] In view of this, we propose a multi-stage sand and cement double-roller crushing and separation equipment. Summary of the invention

[0006] Technical problem to be solved: The purpose of the present invention is to provide a multi-stage sand and cement double-roller crushing and separation equipment to solve the technical problems raised in the above-mentioned background technology.

[0007] Technical solution: The technical solution of the present invention provides a multi-stage sand and cement double-roll crushing and separation device, including a double-roll crusher and a screening and separation device arranged just below the discharge port of the double-roll crusher, the screening and separation device including a fixed frame and a vibration motor, the interior of the fixed frame is connected with a plurality of annular bottom brackets from top to bottom, each annular bottom bracket is provided with a screen structure, and the interior of the fixed frame is provided with a deformation tracker below the topmost screen structure; The deformation tracker includes a bottom support frame connected to the inside of a fixed frame, an insulating outer cylinder shell is arranged above the bottom support frame, a pressure-bearing member is arranged on the insulating outer cylinder shell, a circle of narrowing opening is arranged in the inner cavity of the insulating outer cylinder shell, and the inner cavity of the insulating outer cylinder shell is also filled with a liquid damping medium, two openings are symmetrically arranged on the insulating outer cylinder shell, a driven elastic diaphragm is connected in each opening, and a telescopic member that can perform synchronous telescopic movement with the deformed driven elastic diaphragm is connected between the two driven elastic diaphragms; The telescopic member is connected to an insulating end bottom cover which covers the bottom opening of the insulating outer cylinder shell. Switch terminals are connected to both the telescopic member and the insulating end bottom cover. An alarm is also connected to the side wall of the insulating end bottom cover. When the telescopic member that extends following the deformation of the driven elastic diaphragm drives the switch terminal connected to it to contact the switch terminal on the bottom cover member, the alarm is triggered to turn on.

[0008] As an optional solution of the technical solution of the document of the present invention, the telescopic member includes two horizontal insulating arms, a straight tube with openings at both ends is provided between the two horizontal insulating arms, and the opposite ends of the two horizontal insulating arms are respectively extended into the openings at both ends of the straight tube; The bottom of the straight tube is connected with an insulating box body, and a resistor is installed inside the insulating box body; The two horizontal insulating arm rods are both connected with excitation springs, and the positions of the insulating box body corresponding to the positions of the two excitation springs are both connected with excitation terminals.

[0009] As an optional solution of the technical solution of the document of the present invention, the bottom opening of the insulating box body is sealed and connected to the insulating end bottom cover; Two horizontal insulating arms are connected to two driven elastic diaphragms respectively, and opposite ends of the two horizontal insulating arms extend from the surface of the driven elastic diaphragm, and opposite ends of the two horizontal insulating arms are located in the inner cavity of the insulating outer cylinder shell; The insulating end bottom cover is connected to the bottom support frame.

[0010] As an optional solution of the technical solution of the document of the present invention, the two switch terminals are arranged opposite to each other, and one of the switch terminals is connected to the end of the horizontal insulating arm extending from the surface of the driven elastic diaphragm, and the other switch terminal is connected to the side wall of the inner cavity of the bottom cover of the insulating end.

[0011] As an optional solution of the technical solution of the document of the present invention, the surface of the excitation terminal is flush with the surface of the insulating box body; The two excitation springs are located between the two excitation terminals, and when the driven elastic diaphragm is in an initial relaxation state, the excitation springs are not in contact with the excitation terminals corresponding thereto.

[0012] As an optional solution of the technical solution of the document of the present invention, the resistor, the two excitation springs and the two excitation terminals are all electrically connected to the double-roll crusher.

[0013] As an optional solution of the technical solution of the document of the present invention, the pressure-bearing component includes a passive piston that slides in a sealed manner in the inner cavity of the insulating outer cylinder shell; The bottom end of the passive piston is connected to a first spring, and one end of the first spring away from the passive piston passes through the narrowed opening and is connected to the straight cylinder; A stop rod is provided at the top end of the passive piston; One end of the stop rod away from the passive piston is connected with a conical pressure-bearing head.

[0014] As an optional solution of the technical solution of the document of the present invention, the back-stop rod comprises a passive connecting rod connected between the conical pressure-bearing head and the passive piston; A straight groove is provided on the passive connecting rod, an advance and retreat clamp is slidably inserted in the straight groove, one end of the advance and retreat clamp extends out of the straight groove, and a transition chamfer is provided on the end of the advance and retreat clamp extending out of the straight groove; A second spring is also arranged in the straight groove, and one end of the second spring is connected to the end of the straight groove, and the other end is connected to the end of the advance and retreat clamp; A column groove matching the passive connecting rod is provided at the top of the insulating outer cylinder shell, and an end of the passive connecting rod away from the passive piston passes through the column groove and is connected to the conical pressure bearing head; The column groove side wall is evenly provided with a plurality of annular stop grooves matched with the transition chamfered portion from top to bottom.

[0015] As an optional solution of the technical solution of the document of the present invention, the screen structure includes a screen fixing frame, and the screen fixing frame is connected to the screen; The screen fixing frame is connected to the corresponding annular bottom bracket; The apertures of the sieve holes of the plurality of sieves decrease from top to bottom.

[0016] As an optional solution of the technical solution of the present invention, the vibration motor is connected to the side wall of the fixed frame; A belt conveyor is also installed inside the fixed frame below the screen structure at the lowest level; The top opening of the insulating end bottom cover is sealed and attached to the side wall of the insulating outer cylinder shell.

[0017] Beneficial effects: One or more technical solutions provided in the technical solution of the present invention have at least the following technical effects or advantages: 1. The crushed sand or cement falling from the discharge port of the double-roll crusher is subjected to multi-stage screening and separation treatment by a plurality of screen structures arranged from top to bottom in the screening and separation equipment, and in the process of separating materials, the degree of depression of the screen in the screen structure located on the top layer can be tracked and monitored by the deformation tracker, and when the degree of depression of the screen exceeds a preset critical upper limit, an alarm signal can be sent out to remind the staff to reinstall or replace the depressed screen in time to ensure the separation efficiency of the equipment for the sand or cement fragments after the double-roll crushing.

[0018] 2. When the screen in the uppermost screen structure is sunken and the degree of the sunken screen reaches a preset range, the sunken screen with sand or cement fragments accumulated on its surface exerts pressure on the conical pressure head in the deformation tracker. After the conical pressure head drives the passive piston downward, the hydraulic pressure in the inner cavity of the insulating outer cylinder shell increases and forces the two driven elastic diaphragms to elastically bulge outward. In the process of the two deformed driven elastic diaphragms driving the telescopic member to extend, when the two excitation springs contact their corresponding excitation terminals respectively, the trigger resistor is connected to the circuit of the double-roll crusher, so that the output power of the double-roll crusher decreases, and then the crushing speed of the double-roll crusher also decreases. While saving energy, it can also effectively avoid the situation where the material accumulation on the surface of the screen structure is further aggravated due to the excessive discharge rate of the double-roll crusher when the screen structure is sunken and its screening capacity decreases, which is beneficial to slow down the development speed of the screen depression in the screen structure.

[0019] 3. When the depression degree of the screen in the uppermost screen structure exceeds the preset critical upper limit, the downward-moving pressure-bearing member forces the driven elastic diaphragm to further undergo elastic deformation, driving the switch terminal at the end of the horizontal insulating arm to contact the switch terminal connected to the side wall of the inner cavity of the bottom cover of the insulating end, and triggering the alarm to turn on, reminding the staff to reinstall or replace the depressed screen in time.

[0020] 4. When the screen in the uppermost screen structure is sunken and exerts pressure on the conical pressure head in the deformation tracker and pushes the passive piston downward, the transition chamfer in the stop rod is continuously buckled from one annular stop groove to another annular stop groove, and the passive piston that moves downward pushes the liquid damping medium to flow. At the same time, it is hindered by the narrowed mouth to the flow of the liquid damping medium and the elastic resistance of the first spring and the two driven elastic diaphragms, thereby effectively limiting the up and down reciprocating movement of the pressure-bearing component during the vibration screening process. This not only avoids poor contact between the excitation spring and the excitation terminal, which in turn causes the excitation spring to fail when connected to the roller crusher, but also effectively reduces the probability of the pressure-bearing component falsely triggering the alarm due to the interference of the vibration generated during the screening vibration process, thereby improving the accuracy of monitoring the degree of screen depression. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 For the present invention Figure 1 A partial enlarged schematic diagram of part A.

[0023] Figure 3 It is a schematic diagram of the overall structure of the present invention from another angle.

[0024] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged local structure of part B.

[0025] Figure 5 It is a schematic diagram of the local structure of the screen structure in the present invention.

[0026] Figure 6 For the present invention Figure 5 A partial enlarged schematic diagram of part C in the middle.

[0027] Figure 7 For the present invention Figure 5 A schematic diagram of the enlarged local structure of part D in the middle.

[0028] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged local structure of part E in the middle.

[0029] Fig. 9 For the present invention Figure 7 A schematic diagram of the enlarged local structure of part F in the middle.

[0030] Fig.10 For the present invention Fig. 9 Schematic diagram of the enlarged local structure of part G in the middle.

[0031] Fig.11 For the present invention Fig. 9 Schematic diagram of the enlarged local structure of part H in the middle.

[0032] Description of the numbers in the figure: 10. Double roller crusher; 20. Fixed frame; 30. Ring-shaped bottom bracket; 40. Vibration motor; 502, screen; 503, screen fixing frame; 504, insulating outer cylinder shell; 505, passive connecting rod; 506, conical pressure-bearing head; 507, insulating end bottom cover; 508, alarm; 509, bottom support frame; 510, liquid damping medium; 511, passive piston; 512, advance and retreat clamp; 513, transition chamfer; 514, insulating box body; 515, resistor; 516, straight cylinder; 517, horizontal insulating arm rod; 518, driven elastic diaphragm; 519, excitation spring; 520, excitation terminal; 521, switch terminal; 522, narrowing mouth; 60. Belt conveyor. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Reference Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Fig. 9 The embodiment of the present invention provides a multi-stage sand and cement double-roll crushing and separation device, including a double-roll crusher 10 and a screening and separation device arranged directly below the discharge port of the double-roll crusher 10, the screening and separation device including a fixed frame 20 and a vibration motor 40, and the vibration motor 40 is connected to the side wall of the fixed frame 20; A plurality of annular bottom brackets 30 are connected from top to bottom inside the fixed frame 20, each of which is provided with a screen structure, and a belt conveyor 60 is also installed below the bottom screen structure inside the fixed frame 20; A deformation tracker is provided inside the fixed frame 20 below the uppermost screen structure. The deformation tracker includes a bottom support frame 509 connected to the inside of the fixed frame 20. An insulating outer cylinder shell 504 is provided above the bottom support frame 509. A pressure-bearing member is provided on the insulating outer cylinder shell 504. A circle of narrowed openings 522 is provided in the inner cavity of the insulating outer cylinder shell 504. The inner cavity of the insulating outer cylinder shell 504 is also filled with a liquid damping medium 510. The liquid damping medium 510 is an insulating liquid. The insulating outer cylinder shell 504 has two openings symmetrically formed therein, each of which is connected to a driven elastic diaphragm 518, and a telescopic member is connected between the two driven elastic diaphragms 518 to perform synchronous telescopic movement with the deformed driven elastic diaphragms 518; The telescopic member is connected with an insulating end bottom cover 507 which covers the bottom opening of the insulating outer cylinder shell 504, and the top opening of the insulating end bottom cover 507 is sealed and attached to the side wall of the insulating outer cylinder shell 504; The insulating end bottom cover 507 is connected to the bottom support frame 509; The telescopic member and the insulating end bottom cover 507 are both connected to switch terminals 521, and the side wall of the insulating end bottom cover 507 is also connected to an alarm 508. When the telescopic member that extends following the deformation of the driven elastic diaphragm 518 drives the switch terminal 521 connected to it to contact the switch terminal 521 on the bottom cover member, the alarm 508 is triggered to turn on. The alarm 508 is preferably an audible and visual alarm.

[0037] The crushed sand or cement falling from the discharge port of the double-roll crusher 10 is subjected to multi-stage screening and separation processing by a plurality of screen structures arranged from top to bottom in the screening and separation equipment, and in the process of separating materials, the degree of depression of the screen 502 in the uppermost screen structure can be tracked and monitored by the deformation tracker, and when the depression degree of the screen 502 exceeds a preset critical upper limit, an alarm signal is sent out to remind the staff to reinstall or replace the depressed screen in time to ensure the separation efficiency of the equipment for the sand or cement fragments after the double-roll crushing.

[0038] Reference Figure 7 and Figures 9 to 11 The embodiment of the present invention provides a multi-stage sand and cement roller crushing and separation device, wherein the telescopic member includes two horizontal insulating arms 517, the two horizontal insulating arms 517 are respectively connected to two driven elastic diaphragms 518, and the opposite ends of the two horizontal insulating arms 517 are extended from the surface of the driven elastic diaphragm 518, and the opposite ends of the two horizontal insulating arms 517 are located in the inner cavity of the insulating outer cylinder shell 504; The two switch terminals 521 are arranged opposite to each other, and one of the switch terminals 521 is connected to one end of the horizontal insulating arm 517 extending from the surface of the driven elastic diaphragm 518, and the other switch terminal 521 is connected to the side wall of the inner cavity of the insulating end bottom cover 507. When vibrating and screening sand and cement fragments, since the top opening of the insulating end bottom cover 507 is sealed and attached to the side wall of the insulating outer cylinder shell 504, it can effectively prevent the broken particles from entering the inside of the insulating end bottom cover 507 and affecting the normal activity of the driven elastic diaphragm 518 and the normal contact between the two 521; A straight tube 516 with openings at both ends is provided between the two horizontal insulating arm rods 517, and the opposite ends of the two horizontal insulating arm rods 517 extend into the openings at both ends of the straight tube 516 respectively; The bottom of the straight tube 516 is connected to an insulating box body 514, and the bottom opening of the insulating box body 514 is sealed and connected to the insulating end bottom cover 507; A resistor 515 is installed inside the insulating box 514; The two horizontal insulating arms 517 are connected with excitation springs 519, and the positions of the insulating box body 514 corresponding to the two excitation springs 519 are connected with excitation terminals 520, and the surfaces of the excitation terminals 520 are flush with the surface of the insulating box body 514; The two excitation springs 519 are located between the two excitation terminals 520, and when the driven elastic diaphragm 518 is in an initial relaxed state, the excitation springs 519 are not in contact with the corresponding excitation terminals 520; The resistor 515 , the two excitation springs 519 and the two excitation terminals 520 are all electrically connected to the double-roll mill 10 .

[0039] Reference Figures 3 to 5 , Figure 7 The embodiment of the present invention provides a multi-stage sand and cement roller crushing and separation device, wherein the pressure-bearing component includes a passive piston 511 that slides in a sealed manner in the inner cavity of an insulating outer cylinder shell 504; A first spring is connected to the bottom end of the passive piston 511, and one end of the first spring away from the passive piston 511 passes through the narrowed opening 522 and is connected to the straight cylinder 516; A stop rod is provided at the top of the passive piston 511; One end of the stop rod away from the passive piston 511 is connected to a conical pressure-bearing head 506 .

[0040] When the screen 502 in the uppermost screen structure is sunken and the degree of the sunken screen 502 reaches a preset range, the sunken screen 502 with sand or cement fragments accumulated on its surface exerts pressure on the conical pressure head 506 in the deformation tracker. After the conical pressure head 506 drives the passive piston 511 to move downward, the hydraulic pressure in the inner cavity of the insulating outer cylinder shell 504 increases and forces the two driven elastic diaphragms 518 to elastically bulge outward. In the process of the two deformed driven elastic diaphragms 518 driving the telescopic member to extend, when the two After the excitation springs 519 come into contact with their corresponding excitation terminals 520 respectively, the trigger resistor 515 is connected to the circuit of the double-roller crusher 10, causing the output power of the double-roller crusher 10 to decrease, and then the crushing speed of the double-roller crusher 10 is also reduced. While saving energy, it can also effectively avoid the situation where the screen structure is sunken and its screening capacity is reduced due to the excessively fast discharge rate of the double-roller crusher 10, which further aggravates the accumulation of materials on the surface of the screen structure, which is beneficial to slow down the development speed of the depression of the screen 502 in the screen structure.

[0041] When the depression degree of the screen 502 in the uppermost screen structure exceeds the preset critical upper limit, the downwardly moved pressure-bearing member forces the driven elastic diaphragm 518 to further undergo elastic deformation, driving the switch terminal 521 at the end of the horizontal insulating arm 517 to contact the switch terminal 521 connected to the inner cavity side wall of the insulating end bottom cover 507, and triggers the alarm 508 to open, reminding the staff to reinstall or replace the depressed screen in time.

[0042] Reference Figure 7 and Figure 8 , the embodiment of the present invention provides a multi-stage sand and cement roller crushing and separation device, the back-stop rod comprises a passive connecting rod 505 connected between a conical pressure bearing head 506 and a passive piston 511; A straight groove is provided on the passive connecting rod 505, and an advance and retreat clamp 512 is slidably inserted in the straight groove. One end of the advance and retreat clamp 512 extends out of the straight groove, and a transition chamfer 513 is provided on the end of the advance and retreat clamp 512 extending out of the straight groove. A second spring is also provided in the straight groove, and one end of the second spring is connected to the end of the straight groove, and the other end is connected to the end of the advance and retreat clamp 512; A column groove adapted to the passive connecting rod 505 is formed at the top of the insulating outer cylinder shell 504. The end of the passive connecting rod 505 away from the passive piston 511 passes through the column groove and is connected to the conical pressure-bearing head 506. The side wall of the column groove is evenly provided with a plurality of annular stop grooves adapted to the transition chamfered portion 513 from top to bottom.

[0043] When the screen 502 in the uppermost screen structure is sunken and exerts pressure on the conical pressure head 506 in the deformation tracker and pushes the passive piston 511 downward, the transition chamfer 513 in the stop rod is continuously buckled from one annular stop groove to another annular stop groove, and the passive piston 511 that moves downward pushes the liquid damping medium 510 to flow, while being hindered by the narrowed mouth 522 to the flow of the liquid damping medium 510 and the elastic resistance of the first spring and the two driven elastic diaphragms 518, thereby effectively limiting the reciprocating up and down movement of the pressure-bearing component during the vibration screening process. This not only avoids poor contact between the excitation spring 519 and the excitation terminal 520, which in turn causes the excitation spring 519 to fail when connected to the roller crusher 10, but also effectively reduces the probability of the pressure-bearing component falsely triggering the alarm 508 due to the interference of the vibration generated during the screening vibration process, thereby improving the accuracy of monitoring the degree of screen depression.

[0044] Reference Figure 2 , Figure 5 and Figure 6 The embodiment of the present invention provides a multi-stage sand and cement double roller crushing and separation device, wherein the screen structure includes a screen fixing frame 503, and a screen 502 is connected to the screen fixing frame 503; The screen fixing frame 503 is connected to the corresponding annular bottom bracket 30, and the screen fixing frame 503 is detachably mounted and connected to the corresponding annular bottom bracket 30 by bolt connection or snap connection; The apertures of the sieves 502 decrease from top to bottom.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage sand and cement double-roll crushing and separation equipment, characterized in that: The invention comprises a roller mill (10) and a screening and separation device arranged directly below the discharge port of the roller mill (10), wherein the screening and separation device comprises a fixed frame (20) and a vibration motor (40), wherein a plurality of annular bottom brackets (30) are connected from top to bottom inside the fixed frame (20), each annular bottom bracket (30) is provided with a screen structure, and a deformation tracker is provided inside the fixed frame (20) below the topmost screen structure; The deformation tracker comprises a bottom support frame (509) connected to the inside of a fixed frame (20), an insulating outer cylinder shell (504) is arranged above the bottom support frame (509), a pressure-bearing member is arranged on the insulating outer cylinder shell (504), the inner cavity of the insulating outer cylinder shell (504) is provided with a circle of narrowed openings (522), the inner cavity of the insulating outer cylinder shell (504) is also filled with a liquid damping medium (510), the insulating outer cylinder shell (504) is provided with two openings symmetrically on the left and right, each opening is connected to a driven elastic diaphragm (518), and a telescopic member capable of performing synchronous telescopic movement with the deformed driven elastic diaphragm (518) is connected between the two driven elastic diaphragms (518); The telescopic member is connected to an insulating end bottom cover (507) covering the bottom opening of the insulating outer cylindrical shell (504); the telescopic member and the insulating end bottom cover (507) are both connected to switch terminals (521); an alarm (508) is also connected to the side wall of the insulating end bottom cover (507); and when the telescopic member that extends following the deformation of the driven elastic diaphragm (518) drives the switch terminal (521) connected to it to contact the switch terminal (521) on the bottom cover member, the alarm (508) is triggered to turn on.

2. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 1 is characterized in that: The telescopic member comprises two horizontal insulating arms (517), a straight tube (516) with openings at both ends being arranged between the two horizontal insulating arms (517), and opposite ends of the two horizontal insulating arms (517) respectively extend into the openings at both ends of the straight tube (516); The bottom of the straight cylinder (516) is connected to an insulating box body (514), and a resistor (515) is installed inside the insulating box body (514); The two horizontal insulating arm rods (517) are both connected to an excitation spring sheet (519), and locations on the insulating box body (514) corresponding to the positions of the two excitation spring sheets (519) are both connected to an excitation terminal (520).

3. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 2 is characterized in that: The bottom opening of the insulating box body (514) is sealed and connected to the insulating end bottom cover (507); The two horizontal insulating arm rods (517) are respectively connected to the two driven elastic diaphragms (518), and the opposite ends of the two horizontal insulating arm rods (517) extend from the surface of the driven elastic diaphragm (518), and the opposite ends of the two horizontal insulating arm rods (517) are located in the inner cavity of the insulating outer cylindrical shell (504); The insulating end bottom cover (507) is connected to the bottom support frame (509).

4. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 3 is characterized in that: The two switch terminals (521) are arranged opposite to each other, and one of the switch terminals (521) is connected to an end of the horizontal insulating arm (517) extending from the surface of the driven elastic diaphragm (518), and the other switch terminal (521) is connected to the side wall of the inner cavity of the insulating end bottom cover (507).

5. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 2 is characterized in that: The surface of the excitation terminal (520) is flush with the surface of the insulating box body (514); The two excitation springs (519) are located between the two excitation terminals (520), and when the driven elastic diaphragm (518) is in an initial relaxation state, the excitation springs (519) are not in contact with the excitation terminals (520) corresponding thereto.

6. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 2 is characterized in that: The resistor (515), the two excitation springs (519) and the two excitation terminals (520) are all electrically connected to the double-roll crusher (10).

7. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 1 is characterized in that: The pressure-bearing component comprises a passive piston (511) sealingly sliding in the inner cavity of the insulating outer cylindrical shell (504); The bottom end of the passive piston (511) is connected to a first spring, and one end of the first spring away from the passive piston (511) passes through the narrowed opening (522) and is connected to the straight cylinder (516); A stop rod is provided at the top end of the passive piston (511); One end of the stop rod away from the passive piston (511) is connected to a conical pressure-bearing head (506).

8. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 7 is characterized in that: The anti-retraction rod comprises a passive connecting rod (505) connected between the conical pressure-bearing head (506) and the passive piston (511); The passive connecting rod (505) is provided with a straight groove, in which an advance and retreat clamp (512) is slidably inserted, one end of the advance and retreat clamp (512) protrudes from the straight groove, and a transition chamfer (513) is provided on the end of the advance and retreat clamp (512) protruding from the straight groove; A second spring is also provided in the straight groove, and one end of the second spring is connected to the end of the straight groove, and the other end is connected to the end of the advance and retreat clamp (512); The top end of the insulating outer cylindrical shell (504) is provided with a column groove adapted to the passive connecting rod (505); the end of the passive connecting rod (505) away from the passive piston (511) passes through the column groove and is connected to the conical pressure-bearing head (506); The column groove side wall is evenly provided with a plurality of annular stop grooves matching the transition chamfered portion (513) from top to bottom.

9. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 1 is characterized in that: The screen structure comprises a screen fixing frame (503), and the screen fixing frame (503) is connected to the screen (502); The screen fixing frame (503) is connected to the corresponding annular bottom bracket (30); The apertures of the sieve holes of the plurality of sieves (502) decrease in sequence from top to bottom.

10. The multi-stage sand and cement double-roll crushing and separation equipment according to claim 1 is characterized in that: The vibration motor (40) is connected to a side wall of the fixed frame (20); A belt conveyor (60) is also installed inside the fixed frame (20) below the screen structure at the bottom layer; The top opening of the insulating end bottom cover (507) is sealed and fitted onto the side wall of the insulating outer cylindrical shell (504).

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