A G-grade oil well cement raw material screening device

Abstract

The present invention relates to the field of screening technology, and more specifically, it relates to a G-grade oil well cement raw material screening device, comprising a support frame, and a discharge box is provided on the support frame, and a plurality of groups of elastic mechanisms and lifting mechanisms are provided in an annular array on the upper end of the circumferential side wall of the discharge box, and a screening mechanism is installed above the discharge box through the plurality of groups of elastic mechanisms; a driving gear ring is sleeved on the circumferential side wall of the discharge box, and the driving gear ring is engaged with the lifting mechanism for transmission, a driving motor is fixedly installed on the support frame through a bracket, and a driving gear engaged with the driving gear ring is fixedly installed on the output shaft of the driving motor. The present invention solves the problem of sieve hole clogging often faced by traditional single vibration screening equipment when processing raw materials with complex characteristics.

Description

Technical Field

[0001] The present invention relates to the field of screening technology, and more particularly to a G-grade oil well cement raw material screening device. Background Art

[0002] In the oil well cement production industry, the screening process of G-grade oil well cement raw materials is a key link to ensure product quality. However, due to the characteristics of G-grade oil well cement raw materials, such as wide particle size distribution and easy to stick together into blocks,

[0003] At present, traditional single vibration screening equipment often faces the problem of screen hole clogging when processing raw materials with complex characteristics, resulting in low screening efficiency and requiring frequent shutdowns for cleaning, which increases production costs and affects production efficiency.

[0004] In order to solve the above problems, a G-grade oil well cement raw material screening device is proposed. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the problems existing in the prior art, the present invention provides a G-grade oil well cement raw material screening device to solve the problem of screen hole clogging often faced by traditional single vibration screening equipment mentioned in the background technology when processing raw materials with complex characteristics.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a G-grade oil well cement raw material screening device, comprising a support frame, wherein a material box is provided on the support frame, a plurality of sets of elastic mechanisms and lifting mechanisms are provided in an annular array on the upper end of the circumferential side wall of the material box, and a screening mechanism is installed above the material box via the plurality of sets of elastic mechanisms;

[0009] A driving gear ring is sleeved on the circumferential side wall of the discharge box, and the driving gear ring is engaged with the lifting mechanism for transmission. A driving motor is fixedly installed on the support frame through a bracket, and a driving gear engaged with the driving gear ring is fixedly installed on the output shaft of the driving motor.

[0010] The present invention is further configured such that the elastic mechanism comprises a C-shaped rod arranged in an annular array on the upper end of the circumferential side wall of the discharge box, a support rod slidably mounted on the C-shaped rod, a guide rod arranged on the support rod, and a downward pressure spring sleeved on the guide rod;

[0011] A guide hole is provided at one end of the C-shaped rod away from the circumferential side wall of the discharge box, and the guide rod and the guide hole are matched and plugged.

[0012] The present invention is further configured such that the lifting mechanism includes a driving column rotatably mounted on the circumferential side wall of the discharge box, a first driving bevel tooth and a rotating ear arranged on the driving column, and a top wheel arranged on the rotating ear.

[0013] The present invention is further configured such that a plug-in slot is provided at one end of the driving column away from the blanking box, and an internal thread is provided at the opening of the plug-in slot, and an adjusting member is threadedly installed at the opening of the plug-in slot;

[0014] The circumferential side wall of the driving column is provided with a plug-in hole, and the plug-in hole is connected to the plug-in slot;

[0015] A push rod is movably inserted into the plug hole, and a friction block is provided at one end of the push rod located outside the driving column. The end of the push rod away from the friction block is inserted into the plug groove to abut the adjusting member, and the end of the friction block away from the push rod is in contact with the top wheel.

[0016] The present invention is further configured such that the adjusting member includes a screw threadedly connected to the plug-in slot, a driving surface provided at one end of the screw, and a knob provided at the other end of the screw.

[0017] The present invention is further configured such that the screening mechanism includes an annular side baffle arranged above the discharge box, a screen arranged at the lower end of the inner portion of the annular side baffle, and a limiting ring arranged on the circumferential side wall of the annular side baffle.

[0018] The present invention is further configured such that the screen is rotatably connected to the lower end of the inner wall of the annular side baffle via a rotating shaft, and a first stopper and a telescopic support member are provided at the bottom end of the annular side baffle;

[0019] The connecting line between the first stopper and the telescopic support member is perpendicular to the axis of the rotating shaft on the screen.

[0020] The present invention is further configured such that the telescopic support member includes an adjustment block arranged at the bottom end of the annular side block, an accommodating groove opened on the adjustment block, and a telescopic block and a return spring arranged in the accommodating groove.

[0021] The present invention is further configured such that a rod insertion groove is longitudinally opened in the accommodating groove and penetrates the side wall of the annular side block, and a pressing rod is movably inserted in the rod insertion groove, and a handle is provided on the top of the pressing rod;

[0022] A movable groove is provided on the telescopic block, and a driving slope is provided in the movable groove.

[0023] The present invention is further configured such that a retaining ring is provided on the circumferential side wall of the discharge box, and the driving gear ring is located above the retaining ring;

[0024] The top end of the driving gear ring is provided with a second driving helical tooth meshing with the first driving helical tooth, and the lower end of the circumferential side wall of the driving gear ring is provided with a tooth block meshing with the driving gear.

[0025] (3) Beneficial effects

[0026] Compared with the prior art, the present invention provides a G-grade oil well cement raw material screening device, which has the following beneficial effects:

[0027] 1. The present invention effectively breaks the bonding force between the particles of G-grade oil well cement raw materials by combining the dual effects of vibration and rotation, allowing the particles to move in a complex and efficient trajectory on the screen, thereby significantly improving the screening efficiency. At the same time, this dual action mechanism effectively prevents the blockage of the screen holes, reduces downtime for cleaning, and improves the continuity and stability of the production line.

[0028] 2. When the raw materials are small and the particles are large and not easy to clog the sieve holes, the present invention can reduce the friction of the top wheel by adjustment so that it can roll freely during the rotation process, reduce the additional driving force on the screen, thereby reducing energy consumption and achieving energy-saving operation. When the raw materials are large or there is a situation where the sieve holes are easily clogged, the friction of the top wheel can be increased by adjustment so that it is locked and cannot rotate. At this time, the top wheel will drive the screen to rotate additionally during the rotation process, which not only enhances the vibration effect during the screening process, but also changes the position of the sieve holes through the rotation of the screen, effectively preventing the sieve holes from being clogged and improving the screening efficiency. It ensures the screening effect and optimizes energy consumption through dynamic adjustment of the friction of the top wheel, thereby improving the overall performance and economy of the screening device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the G-grade oil well cement raw material screening device.

[0030] Figure 2 This is a schematic diagram of the front view of the G-grade oil well cement raw material screening device.

[0031] Figure 3 This is a schematic diagram of the structure of the screening mechanism in the G-grade oil well cement raw material screening device.

[0032] Figure 4 This is a schematic diagram of the front cross-sectional structure of a G-grade oil well cement raw material screening device.

[0033] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle.

[0034] Figure 6 This is a schematic diagram of the exploded structure of the screening mechanism and discharge box in the G-grade oil well cement raw material screening device.

[0035] Figure 7 This is a schematic diagram of the structure of the jacking mechanism in the G-grade oil well cement raw material screening device.

[0036] Figure 8 Schematic diagram of the unlocking structure of the telescopic support in the G-grade oil well cement raw material screening device.

[0037] In the figure: 1. Support frame; 2. Unloading box; 201. Retaining ring; 3. Elastic mechanism; 301. C-shaped rod; 302. Support rod; 303. Guide rod; 304. Down-pressing spring; 305. Guide hole; 4. Lifting mechanism; 401. Drive column; 402. First drive bevel gear; 403. Rotating ear; 404. Top wheel; 405. Insertion groove; 406. Insertion hole; 407. Push rod; 408. Friction block; 5. Screening mechanism; 501. Annular side block; 502. Screen; 503. Limit Position ring; 504, first stop block; 6, driving gear ring; 601, second driving bevel gear; 602, gear block; 7, driving motor; 8, driving gear; 9, adjusting member; 901, screw rod; 902, driving surface; 903, knob; 10, telescopic support member; 1001, adjusting block; 1002, receiving groove; 1003, telescopic block; 1004, return spring; 1005, rod insertion groove; 1006, pressing rod; 1007, handle; 1008, movable groove; 1009, driving slope. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0040] In the present invention, unless otherwise specified, directions such as "up" and "down" are generally used with respect to the directions shown in the drawings, or with respect to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" are generally used with respect to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0041] For examples, see Figure 1 - Figure 8 A G-grade oil well cement raw material screening device includes a support frame 1, and a material box 2 is provided on the support frame 1. A plurality of elastic mechanisms 3 and a lifting mechanism 4 are provided in an annular array on the upper end of the circumferential side wall of the material box 2, and a screening mechanism 5 is installed above the material box 2 through the plurality of elastic mechanisms 3;

[0042] A driving gear ring 6 is sleeved on the circumferential side wall of the discharge box 2, and the driving gear ring 6 is engaged with the lifting mechanism 4 for transmission. A driving motor 7 is fixedly installed on the support frame 1 through a bracket, and a driving gear 8 engaged with the driving gear ring 6 is fixedly installed on the output shaft of the driving motor 7.

[0043] The raw materials are poured onto the screening mechanism 5, and the driving motor 7 is started, so that the driving gear 8 engages the driving gear ring 6, thereby causing the driving gear ring 6 to rotate and engage the lifting mechanism 4. When the lifting mechanism 4 rotates to a higher point, it first contacts the lifting screening mechanism 5, causing the elastic mechanism 3 to be compressed. Then, when the lifting mechanism 4 rotates to a lower point, the elastic reset of the elastic mechanism 3 and its own gravity cause the screening mechanism 5 to fall. When the lifting mechanism 4 rotates, the screening mechanism 5 performs a high-frequency up and down movement, thereby screening the raw materials in the screening mechanism 5, and the screened raw materials fall and are collected through the discharge box 2, wherein the lower end of the discharge box 2 is conically set to facilitate the falling of the screened raw materials, and a discharge pipe mouth is provided at the bottom of the cone.

[0044] Furthermore, the screening mechanism 5 and the multiple sets of elastic mechanisms 3 are rotationally connected, that is, the screening mechanism 5 can rotate about its own axis. When the lifting mechanism 4 rotates to lift the screening mechanism 5, the lifting mechanism 4 also has a driving force on the screening mechanism 5, and its driving force can drive the screening mechanism 5 to rotate. Through the rotation of the screening mechanism 5, the position of the sieve holes will be offset, thereby avoiding the occurrence of sieve hole blockage.

[0045] The elastic mechanism 3 includes a C-shaped rod 301 arranged in an annular array on the upper end of the circumferential side wall of the discharge box 2, a support rod 302 slidably mounted on the C-shaped rod 301, a guide rod 303 arranged on the support rod 302, and a downward pressure spring 304 sleeved on the guide rod 303;

[0046] A guide hole 305 is formed at one end of the C-shaped rod 301 away from the circumferential side wall of the discharge box 2 , and the guide rod 303 is matched and plugged into the guide hole 305 .

[0047] The C-shape of the C-shaped rod 301 is only used to describe the shape. The upper and lower sections of the C-shape are horizontal cross plates, and a vertical cross plate is connected between the upper and lower sections. The support rod 302 and the vertical cross plate are slidably matched, and the end of the support rod 302 away from the C-shaped rod 301 is used to support the screening mechanism 5.

[0048] The screening mechanism 5 is supported by the support rods 302 on the multiple groups of elastic mechanisms 3, so that the screening mechanism 5 is located above the discharge box 2. When the screening mechanism 5 is pushed up by the lifting mechanism 4, the screening mechanism 5 drives the support rods 302 to move up, thereby squeezing the downward pressure spring 304. When the lifting mechanism 4 rotates to the lower point, the squeezed downward pressure spring 304 pushes the screening mechanism 5 to move down and reset. It should be noted that the lowest point of the lifting mechanism 4 does not contact the screening mechanism 5. Therefore, the screening mechanism 5 moves downward under the action of the downward pressure spring 304, and a certain inertia is generated. The inertia further pushes the raw materials downward through the sieve holes for screening, so that the screening mechanism 5 can not only perform simple screening in the vibration formed by the high-frequency up and down movement, but also improve the screening efficiency through inertia, and the reaction force of its inertia will also cause larger raw materials to bounce up, thereby avoiding clogging of the sieve holes.

[0049] The lifting mechanism 4 includes a driving column 401 rotatably mounted on the circumferential side wall of the discharge box 2 , a first driving bevel gear 402 and a rotating ear 403 provided on the driving column 401 , and a lifting wheel 404 provided on the rotating ear 403 .

[0050] The lifting mechanism 4 is provided with multiple groups, and is arranged in a circular array on the circumferential side wall of the discharge box 2. Through the arrangement of multiple groups of lifting mechanisms 4, the lifting of the screening mechanism 5 is made more uniform, and it can move up and down synchronously to perform vibration screening of raw materials. The driving column 401 is a cylinder, which is rotatably connected to the upper end of the circumferential side wall of the discharge box 2 through a rotating shaft. The first driving bevel gear 402 is provided on the circumferential side wall of the driving column 401 close to the discharge box 2, and the first driving bevel gear 402 is arranged in a circular array. The first driving bevel gear 402 in the circular array is engaged with the driving gear ring 6 for transmission, thereby driving the rotating ear 403 on the driving column 401 to rotate, wherein the rotating ear 403 is provided with multiple groups in a circular array, and the top wheel 40 4 is rotatably mounted on the end of the rotating ear 403 away from the driving column 401, wherein the multiple sets of rotating ears 403 in the annular array are located outside the driving gear ring 6, so that when the driving gear ring 6 engages the first driving bevel gear 402 to drive the driving column 401 to rotate, the rotating ear 403 will not interfere with the driving gear ring 6. It should also be noted that when the top wheels 404 on two adjacent sets of rotating ears 403 in the annular array are rotated to a horizontal position, their height is lower than the top of the discharge box 2. However, when the top wheels 404 on the multiple sets of rotating ears 403 are not horizontal, the top wheel 404 on one set of rotating ears 403 will be higher than the top of the discharge box 2, thereby lifting the screening mechanism 5.

[0051] An inserting slot 405 is formed at one end of the driving column 401 away from the blanking box 2, and an internal thread is formed at the opening of the inserting slot 405, and an adjusting member 9 is threadedly installed at the opening of the inserting slot 405;

[0052] A plug hole 406 is formed on the circumferential side wall of the driving column 401, and the plug hole 406 is connected to the plug slot 405;

[0053] A push rod 407 is movably inserted into the plug-in hole 406, and a friction block 408 is provided at one end of the push rod 407 located outside the driving column 401. The end of the push rod 407 away from the friction block 408 is inserted into the plug-in groove 405 to abut against the adjusting member 9, and the end of the friction block 408 away from the push rod 407 is in contact with the top wheel 404.

[0054] Rotating ears 403 are provided on both sides of the top wheel 404, and the top wheel 404 is stabilized by the two rotating ears 403. The friction block 408 and the push rod 407 are arranged in the gap between the two rotating ears 403. The push rod 407 is used to push against the adjusting member 9 to adjust the position of the friction block 408. The friction block 408 is arranged in the gap between the two rotating ears 403. The two rotating ears 403 make the friction block 408 only able to move forward and not rotate when it moves with the push rod 407, that is, the two rotating ears 403 limit the friction block 408 to ensure that when the adjusting member 9 pushes the push rod 407 so that the friction block 408 is close to the top wheel 404, the friction block 408 can fit the top wheel 404. It should be noted that the end of the friction block 408 away from the push rod 407 is a curved surface that matches the top wheel 404.

[0055] The adjusting member 9 includes a screw rod 901 threadedly connected to the inserting slot 405 , a driving surface 902 provided at one end of the screw rod 901 , and a knob 903 provided at the other end of the screw rod 901 .

[0056] The internal threads of the screw 901 and the plug-in groove 405 match, and the position of the driving surface 902 on the screw 901 in the plug-in groove 405 is adjusted by turning the knob 903. The driving surface 902 is the inclined surface at the end of the screw 901. When its small diameter end is flush with the position of the push rod 407, the push rod 407 can be inserted into the plug-in groove 405, thereby making the friction block 408 disengage from the top wheel 404, so that the top wheel 404 can rotate when the screening mechanism 5 is lifted up by the rotating ear 403 as the driving column 401 rotates. Therefore, the top wheel 404 has a small driving force on the rotation of the screening mechanism 5, so the energy consumption required is small. It is suitable for screening with less raw materials and less raw materials with large particles, that is, it is used when the screen holes are not easily blocked. It mainly drives the screening mechanism 5 to vibrate up and down for screening by rotating the top wheel 404, and has little effect on the rotation of the screening mechanism 5.

[0057] When the knob 903 is rotated, so that the large diameter section of the driving surface 902 is flush with the position of the push rod 407, the push rod 407 will be pushed outward by the driving surface 902, so that the push rod 407 drives the friction block 408 to fit the top wheel 404, and the friction force makes the top wheel 404 locked and unable to rotate. At this time, the driving gear ring 6 engages the first driving bevel gear 402, so that the driving column 401 drives the locked top wheel 404 to rotate. In addition to lifting the screening mechanism 5, the friction between the locked top wheel 404 and the screening mechanism 5 will also drive the screening mechanism 5 to rotate around its own axis, so that the screening mechanism 5 can not only vibrate up and down, but also rotate, so that when the raw material vibrates, the position of the sieve hole is changed, the sieve hole is unblocked, and the sieve hole is avoided from being blocked, thereby improving the screening efficiency.

[0058] The screening mechanism 5 includes an annular side block 501 arranged above the discharge box 2 , a screen 502 arranged at the lower end of the annular side block 501 , and a limiting ring 503 arranged on the circumferential side wall of the annular side block 501 .

[0059] There are two groups of limiting rings 503, which are respectively arranged at the upper and lower ends of the support rod 302. The upper and lower groups of limiting rings 503 are used to limit the support rod 302. At the same time, the annular side block 501 can rotate around its own axis through the sliding matching of the limiting ring 503 and the support rod 302.

[0060] It should be noted that the limiting ring 503 below the support rod 302 and the top wheel 404 are in conflict with each other, so that when the lifting mechanism 4 rotates, it can drive the screening mechanism 5 to vibrate up and down.

[0061] The screen 502 is rotatably connected to the lower end of the inner wall of the annular side block 501 via a rotating shaft, and the bottom end of the annular side block 501 is provided with a first stopper 504 and a telescopic support member 10;

[0062] The connecting line between the first stopper 504 and the telescopic support member 10 is perpendicular to the axis of the rotating shaft on the screen 502 .

[0063] In the initial state, the telescopic support 10 is in an extended state, and the rotating screen 502 is supported at the bottom by the first stop block 504 and the extended telescopic support 10, so that it remains horizontal for vibration screening of the raw materials. The raw materials screened for the first time are discharged from the discharge pipe of the discharge box 2 and collected. At this time, a new collection frame is replaced, the telescopic support 10 is retracted, and then the screen 502 is manually pressed close to one end of the telescopic support 10 to rotate, so that the remaining material on the screen 502 is cleaned up.

[0064] The telescopic support member 10 includes an adjustment block 1001 arranged at the bottom end of the annular side block 501 , a receiving groove 1002 opened on the adjustment block 1001 , and a telescopic block 1003 and a return spring 1004 arranged in the receiving groove 1002 .

[0065] The telescopic support member 10 and the first stop block 504 are arranged relative to each other, the adjusting block 1001 and the annular side block 501 are integrally formed, and the adjusting block 1001 is a protrusion at the bottom end of the annular side block 501, and the top of the accommodating groove 1002 is flush with the bottom of the screen 502, so that when the telescopic block 1003 is extended, it can support the screen 502, and one end of the return spring 1004 abuts against the side wall of the accommodating groove 1002, and the other end abuts against one end of the telescopic block 1003. In the initial state, under the action of the return spring 1004, the telescopic block 1003 protrudes from the accommodating groove 1002 away from one end of the return spring 1004, extends to the bottom of the screen 502, and supports the screen 502.

[0066] A rod insertion groove 1005 is longitudinally opened in the receiving groove 1002 and penetrates the side wall of the annular side block 501. A pressing rod 1006 is movably inserted in the pressing rod insertion groove 1005. A handle 1007 is provided on the top of the pressing rod 1006.

[0067] A movable groove 1008 is formed on the telescopic block 1003 , and a driving slope 1009 is provided in the movable groove 1008 .

[0068] The lower pressure rod 1006 is detachable. When screening the raw materials, the lower pressure rod 1006 can be removed to avoid vibration when it is inserted into the rod slot 1005, which affects the screening effect. When the lower pressure rod 1006 is inserted into the rod slot 1005, without the action of external force, the return spring 1004 pushes the telescopic block 1003 to extend, so that the driving slope 1009 on the movable slot 1008 pushes the lower pressure rod 1006 to move upward, that is, in the initial state, the lower pressure rod 1006 is The end of 06 contacts the driving slope 1009. When it is necessary to unlock the support of the telescopic block 1003 on the screen 502, a downward pressure is manually applied to the downward pressure rod 1006, thereby driving the slope 1009 to move the telescopic block 1003 toward the inside of the accommodating groove 1002, thereby compressing the return spring 1004, so that one end of the screen 502 has no support, so that under the gravity of the remaining raw materials or human push, the screen 502 rotates, and the remaining materials on the screen 502 can be cleaned.

[0069] A retaining ring 201 is provided on the circumferential side wall of the blanking box 2, and the driving gear ring 6 is located above the retaining ring 201;

[0070] The top of the driving gear ring 6 is provided with a second driving bevel tooth 601 meshing with the first driving bevel tooth 402 , and the lower end of the circumferential side wall of the driving gear ring 6 is provided with a gear block 602 meshing with the driving gear 8 .

[0071] By disposing the retaining ring 201 , the driving gear ring 6 can stably engage with the first driving bevel teeth 402 on the driving column 401 .

[0072] In all the schemes mentioned above, the connection between the two parts can be selected according to actual conditions by welding, bolt and nut connection, bolt or screw connection or other well-known connection methods, which will not be described here one by one. In the above, all fixed connections are preferably welded. Although the embodiments of the present invention have been shown and described, it can be understood by those skilled in the art that various changes, modifications, substitutions and deformations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A G-grade oil well cement raw material screening device, characterized by: The invention comprises a support frame (1), wherein a material discharge box (2) is provided on the support frame (1), a plurality of elastic mechanisms (3) and a lifting mechanism (4) are provided in an annular array on the upper end of the circumferential side wall of the material discharge box (2), and a screening mechanism (5) is installed above the material discharge box (2) via the plurality of elastic mechanisms (3); A driving gear ring (6) is sleeved on the circumferential side wall of the discharge box (2), and the driving gear ring (6) is meshed with the lifting mechanism (4) for transmission. A driving motor (7) is fixedly mounted on the support frame (1) through a bracket, and a driving gear (8) meshed with the driving gear ring (6) is fixedly mounted on the output shaft of the driving motor (7); The lifting mechanism (4) includes a driving column (401) rotatably mounted on the circumferential side wall of the discharge box (2), a first driving bevel tooth (402) and a rotating ear (403) provided on the driving column (401), and a lifting wheel (404) provided on the rotating ear (403); An end of the driving column (401) away from the discharge box (2) is provided with a plug-in slot (405), and an internal thread is provided at the opening of the plug-in slot (405), and an adjusting member (9) is threadedly installed at the opening of the plug-in slot (405); A plug hole (406) is provided on the circumferential side wall of the driving column (401), and the plug hole (406) is communicated with the plug slot (405); A push rod (407) is movably inserted into the insertion hole (406), and a friction block (408) is provided at one end of the push rod (407) located outside the driving column (401). The end of the push rod (407) away from the friction block (408) is inserted into the insertion groove (405) to abut against the adjusting member (9), and the end of the friction block (408) away from the push rod (407) is in contact with the top wheel (404).

2. A G-grade oil well cement raw material screening device according to claim 1, characterized in that: The elastic mechanism (3) comprises a C-shaped rod (301) arranged in an annular array on the upper end of the circumferential side wall of the blanking box (2), a support rod (302) slidably mounted on the C-shaped rod (301), a guide rod (303) arranged on the support rod (302), and a downward pressure spring (304) sleeved on the guide rod (303); A guide hole (305) is provided at one end of the C-shaped rod (301) away from the circumferential side wall of the blanking box (2), and the guide rod (303) and the guide hole (305) are matched and plugged.

3. The G-grade oil well cement raw material screening device according to claim 2, characterized in that: The adjusting member (9) includes a screw rod (901) threadedly connected to the insertion slot (405), a driving surface (902) provided at one end of the screw rod (901), and a knob (903) provided at the other end of the screw rod (901).

4. The G-grade oil well cement raw material screening device according to claim 3, characterized in that: The screening mechanism (5) comprises an annular side block (501) arranged above the discharge box (2), a screen (502) arranged at the lower end inside the annular side block (501), and a limiting ring (503) arranged on the circumferential side wall of the annular side block (501).

5. The G-grade oil well cement raw material screening device according to claim 4, characterized in that: The screen (502) is rotatably connected to the lower end of the inner wall of the annular side block (501) via a rotating shaft, and the bottom end of the annular side block (501) is provided with a first stopper (504) and a telescopic support member (10); The connecting line between the first stopper (504) and the telescopic support member (10) is arranged perpendicular to the axis of the rotating shaft on the screen (502).

6. The G-grade oil well cement raw material screening device according to claim 5, characterized in that: The telescopic support member (10) comprises an adjustment block (1001) arranged at the bottom end of the annular side block (501), a receiving groove (1002) provided on the adjustment block (1001), and a telescopic block (1003) and a return spring (1004) arranged in the receiving groove (1002).

7. The G-grade oil well cement raw material screening device according to claim 6, characterized in that: A rod insertion groove (1005) is longitudinally provided in the receiving groove (1002) and penetrates the side wall of the annular side block (501), and a pressing rod (1006) is movably inserted in the rod insertion groove (1005), and a handle (1007) is provided at the top of the pressing rod (1006); A movable groove (1008) is provided on the telescopic block (1003), and a driving slope (1009) is provided in the movable groove (1008).

8. The G-grade oil well cement raw material screening device according to claim 7, characterized in that: A retaining ring (201) is provided on the circumferential side wall of the discharge box (2), and the driving gear ring (6) is located above the retaining ring (201); The top end of the driving gear ring (6) is provided with a second driving bevel tooth (601) meshing with the first driving bevel tooth (402), and the lower end of the circumferential side wall of the driving gear ring (6) is provided with a tooth block (602) meshing with the driving gear (8).

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