Well cementation cement slurry stirring uniformity automatic control device

Abstract

The invention discloses an automatic control device for stirring uniformity of well cementation cement slurry, which belongs to the field of well cementation equipment and comprises a stirring tank, a stirring device, a return pipe, a pressure-bearing sliding plate and a return controller. The pressure-bearing sliding plate is arranged at the lower part of the stirring tank and can move under the action of gravity; the stirring device comprises a backflow pipe and stirring blades arranged on the backflow pipe, a blocking sliding pipe is arranged in the center of the pressure-bearing sliding plate and extends downwards, the stirring blades are arranged at the top of the pressure-bearing sliding plate, a plurality of backflow holes are formed in the backflow pipe and located on the lower portion of the stirring blades, and the backflow pipe is arranged in the blocking sliding pipe in a sleeved mode; the backflow controller comprises a driving device and a driven device, the driving device and the driven device are arranged at the bottom of the stirring tank and connected with the plugging sliding pipe and the backflow pipe respectively, and when the plugging sliding pipe moves downwards, the driving device and the driven device can be combined; by automatically controlling the cement paste stirring device, the labor input can be reduced while the stirring uniformity is improved, and the labor cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cementing equipment, and is an automatic control device for cementing slurry mixing uniformity. BACKGROUND

[0002] In cementing construction, the uniformity of cement slurry is one of the most important indicators, and uneven cement slurry will lead to undesirable cement slurry fluidity, and even seriously affect the cementing quality. At present, the cement slurry mixing method used in domestic and foreign cementing sites is cement pump truck mixing, and the mixed cement slurry is directly injected into the well. When the mixing speed is fast, the cement slurry is often mixed unevenly. The cement slurry is mixed and then stirred by a stirrer, and the mixed slurry is mixed again to achieve uniform mixing. This method is not effective in large displacement construction, and the stirring speed and the secondary mixing speed of the stirrer need to be adjusted manually, which is time-consuming and has low accuracy. The stirring speed cannot be matched with the cement slurry mixing speed, resulting in unstable stirring uniformity. SUMMARY

[0003] In view of the problems of poor mixing effect when the displacement of the conventional cementing slurry mixing method is large, time-consuming manual control of the mixing and stirring speed, low accuracy, and unstable uniformity of the cement slurry mixing, an automatic control device for cementing slurry mixing uniformity and a control method are developed.

[0004] The present application is realized by the following technical solutions:

[0005] An automatic control device for cementing slurry mixing uniformity, comprising a stirring tank, a stirring device, a reflux pipe, a pressure-bearing sliding plate, and a reflux controller.

[0006] The pressure-bearing sliding plate is arranged at the lower part of the stirring tank and can move under the action of gravity. A spring is arranged between the pressure-bearing sliding plate and the stirring tank.

[0007] The stirring device comprises a reflux pipe and stirring blades arranged thereon. The center of the pressure-bearing sliding plate is provided with a blocking sliding pipe extending downward. The stirring blades are arranged at the top of the pressure-bearing sliding plate. A plurality of reflux holes are arranged on the reflux pipe and located at the lower part of the stirring blades. The reflux pipe is sleeved in the blocking sliding pipe, and the upward and downward movement of the blocking sliding pipe can close or open the reflux holes.

[0008] The reflux controller comprises a driving device and a driven device. The driving device and the driven device are arranged at the bottom of the stirring tank and connected to the blocking sliding pipe and the reflux pipe, respectively. When the blocking sliding pipe moves downward, the driving device and the driven device are combined to rotate the stirring device.

[0009] Preferably, the plurality of reflux holes are arranged at intervals from top to bottom.

[0010] Preferably, the reflux pipe and the lower end of the blocking slide pipe pass through the bottom of the stirring tank, the lower end of the reflux pipe extends into the lower end of the blocking slide pipe, the driving device is connected with the lower end of the blocking slide pipe, and the driven device is connected with the lower end of the reflux pipe.

[0011] Preferably, the driving device comprises a motor, a friction transmission wheel and a push-pull connecting rod.

[0012] The motor is fixed on the bottom of the stirring tank, the friction transmission wheel is sleeved on the output shaft of the motor and can move axially, the lower end of the blocking slide pipe is fixedly connected with a transverse plate, one end of the push-pull connecting rod is connected with the end of the transverse plate, and the other end of the push-pull connecting rod is connected with the friction transmission wheel through a cross pipe.

[0013] The driven device comprises a friction disc, and the friction disc is arranged on the lower end of the reflux pipe.

[0014] Preferably, a coaxial material control spiral body is sleeved in the reflux pipe, the upper end of the reflux pipe is rotatably connected with the upper end of the stirring tank, the upper end of the material control spiral body passes out of the reflux pipe, and the upper end of the material control spiral body is connected with the reflux pipe through a gear structure.

[0015] Preferably, the gear structure comprises a driving gear, a transmission gear and a driven gear, the driving gear is fixedly connected with the upper end of the reflux pipe, the driven gear is fixedly connected with the material control spiral body, and the driving gear is engaged with the driven gear through the transmission gear.

[0016] Preferably, the top of the stirring arm is further provided with a lifting device, and the lifting device is connected with the material control spiral body.

[0017] Preferably, the lifting device comprises an inclined connecting rod, a guide vertical rod and a lifting hanger.

[0018] The lifting hanger is rotatably connected with the material control spiral body, one end of the lifting hanger is slidably connected with the guide vertical rod, the other end of the lifting hanger is rotatably connected with one end of the inclined connecting rod, and the other end of the inclined connecting rod is eccentrically connected with the transmission gear.

[0019] Preferably, the stirring tank is provided with a feeding pipe and a discharging pipe and is located at the upper portion of the pressure-bearing sliding plate.

[0020] Preferably, the bottom of the stirring blade is provided with a limiting plate, and the limiting plate slides on the pressure-bearing sliding plate.

[0021] Compared with the prior art, the present application has the following beneficial technical effects:

[0022] This invention provides an automatic control device for the uniformity of cement slurry mixing in well cementing, comprising a mixing tank, a mixing device, a return pipe, a pressure-bearing slide plate, and a return controller. By installing a return controller at the bottom of the mixing tank, the amount of cement slurry can be kept within a certain range during mixing, improving mixing efficiency. The mixing control structure of the return controller allows for different mixing speeds depending on the amount of cement slurry, further improving the uniformity of cement slurry mixing. The material control auger increases the return speed during cement slurry return, preventing cement slurry accumulation or even overflow within the mixing tank. Automatic control of the cement slurry mixing device improves mixing uniformity while reducing manual labor, saving labor costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the mixing tank of Embodiment 1 of the present invention from a first angle;

[0024] Figure 2 This is a schematic diagram of the mixing tank of Embodiment 1 of the present invention from a second angle;

[0025] Figure 3 This is a cross-sectional view of the mixing tank in Embodiment 1 of the present invention. Figure 1 ;

[0026] Figure 4 This is a cross-sectional view of the mixing tank in Embodiment 1 of the present invention. Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the reflux pipe in Embodiment 1 of the present invention;

[0028] Figure 6 This is a schematic diagram of the recirculation controller according to Embodiment 1 of the present invention;

[0029] Figure 7 This is a schematic diagram of a partial structure of the recirculation controller in Embodiment 1 of the present invention. Figure 1 ;

[0030] Figure 8 This is a schematic diagram of a partial structure of the recirculation controller in Embodiment 1 of the present invention. Figure 2 ;

[0031] Figure 9 This is a schematic diagram of the material control screw of Embodiment 1 of the present invention.

[0032] In the figure: stirring tank 1; top cover 2; reflux pipe 3; reflux port 3-1; friction disc 3-2; reflux controller 4; pressure bearing slide 4-1; block sliding pipe 4-2; cross frame plate 4-3; vertical shaft 4-4; pressure bearing spring 4-5; motor 4-6; multi-prong rod 4-7; cross pipe 4-8; friction transmission wheel 4-9; pipe rack 4-10; push-pull connecting rod 4-11; material control spiral 5; rotating rod 6; upper bevel gear 7; lower bevel gear 8; linkage bevel gear 9; rotating disc 10; tilting connecting rod 11; lifting hanger 12; guide vertical rod 13; rotating sleeve 14. DETAILED DESCRIPTION

[0033] The application will be further described in detail below with reference to the accompanying drawings, which are provided to explain the application rather than limit it.

[0034] The application relates to a cement slurry stirring uniformity automatic control device, which comprises a stirring tank 1, a stirring device, a reflux pipe 3, a pressure bearing slide 4-1, a reflux controller 4 and a material control spiral 5.

[0035] The pressure bearing slide 4-1 is arranged at the lower part of the stirring tank 1 and can move under the action of gravity, the edge of the pressure bearing slide 4-1 is in sliding sealing connection with the side wall of the stirring tank 1, a spring is arranged between the pressure bearing slide 4-1 and the stirring tank 1, and an inlet pipe and an outlet pipe are arranged on the stirring tank 1 and located at the upper part of the pressure bearing slide 4-1.

[0036] The stirring device comprises the reflux pipe 3 and stirring blades arranged on the reflux pipe 3, the center of the pressure bearing slide 4-1 is provided with the block sliding pipe 4-2, the stirring blades are arranged at the top of the pressure bearing slide 4-1, a plurality of reflux holes 3-1 are arranged on the reflux pipe 3 and located at the lower part of the stirring blades, the reflux pipe 3 is sleeved in the block sliding pipe 4-2, and the up-and-down movement of the block sliding pipe 4-2 can make the reflux holes 3-1 closed or opened.

[0037] The reflux controller comprises a driving device and a driven device, the driving device and the driven device are arranged at the bottom of the stirring tank and connected with the block sliding pipe 4-2 and the reflux pipe 3 respectively, and the driving device and the driven device can make the stirring device rotate when the block sliding pipe 4-2 moves downward.

[0038] The material control spiral 5 is sleeved in the reflux pipe 3, the upper end of the reflux pipe 3 is in rotary connection with the upper end of the stirring tank, the upper end of the material control spiral 5 penetrates out of the reflux pipe 3, and the upper end of the material control spiral 5 is connected with the reflux pipe 3 through a gear structure.

[0039] The lower ends of the reflux pipe and the block sliding pipe 4-2 penetrate through the bottom of the stirring tank, the lower end of the reflux pipe extends into the lower end of the block sliding pipe 4-2, the driving device is connected with the lower end of the block sliding pipe 4-2, and the driven device is connected with the lower end of the reflux pipe.

[0040] The driving device comprises a motor, a friction transmission wheel and a push-pull connecting rod; the motor is fixed at the bottom of the stirring tank, the friction transmission wheel is sleeved on the output shaft of the motor and can move axially, the lower end of the blocking slide pipe 4-2 is fixedly connected with a cross plate, one end of the push-pull connecting rod is connected with the end of the cross plate, and the other end of the push-pull connecting rod is connected with the friction transmission wheel through a cross pipe. The driven device comprises a friction disc 3-2, which is arranged at the lower end of the return pipe 3. When the friction transmission wheel is combined with the friction disc to drive the stirring blade to rotate, the cement slurry is stirred.

[0041] The return pipe 3 is a hollow structure, the material control spiral body 5 is sleeved in the return pipe 3, the upper end of the return pipe 3 is connected with the top cover 2 at the top of the stirring tank, the upper end of the material control spiral body 5 passes through the upper end of the return pipe 3 and is connected with the gear structure and the return pipe 3, and the return pipe drives the material control spiral body 5 to rotate through the gear structure.

[0042] The gear structure comprises a bevel gear transmission device, comprising two coaxial driving gears, a transmission gear and a driven gear, the driving gear is fixedly connected with the upper end of the return pipe, the driven gear is fixedly connected with the material control spiral body 5, and the driving gear is engaged with the driven gear through the transmission gear.

[0043] The top cover is also provided with a lifting device for driving the material control spiral body 5 to move up and down in the return pipe, the lifting device is an eccentric wheel mechanism, comprising an inclined connecting rod 11, a guide vertical rod 13 and a lifting hanger 12, the transmission gear is arranged on the top cover through a support structure, the lifting hanger is horizontally arranged at the top of the material control spiral body 5, one end of the lifting hanger is slidably connected with the guide vertical rod 13, the other end of the lifting hanger is rotatably connected with one end of the inclined connecting rod 11, the other end of the inclined connecting rod 11 is eccentrically connected with the transmission gear, and the transmission gear rotates to drive the lifting hanger to move up and down through the inclined connecting rod 11, thereby driving the material control spiral body 5 to move up and down.

[0044] Example 1

[0045] Reference Figures 1-9 An automatic control device for cement slurry stirring uniformity in well cementing, comprising a stirring tank 1, a top cover 2, a return pipe 3 and a return controller 4.

[0046] The stirring tank 1 of the automatic control device for cement slurry stirring uniformity in well cementing is a cylindrical structure with an open top, the top of which is connected with the top cover 2, the inside of which is provided with a horizontal downward step surface, and four directions of front, back, left and right are respectively provided with two cement slurry inflow pipes and two cement slurry discharge pipes, the two cement slurry inflow pipes are oppositely arranged and close to the top of the stirring tank 1, and the two cement slurry discharge pipes are oppositely arranged and close to the step surface of the stirring tank 1 above the step surface.

[0047] The backflow controller 4 comprises a pressure bearing slide plate 4-1 in a disc shape, and a through hole is formed in the center of the pressure bearing slide plate 4-1. A sealing slide pipe 4-2 is arranged at the lower part of the pressure bearing slide plate 4-1, and the inner diameter of the sealing slide pipe 4-2 is the same as that of the through hole. The length of the sealing slide pipe 4-2 is longer than the distance from the step surface of the stirring tank 1 to the bottom of the stirring controller 1. A through hole is formed in the bottom of the stirring tank 1, and the inner diameter of the through hole is the same as that of the sealing slide pipe 4-2. The backflow controller 4 is arranged below the step surface of the stirring tank 1. The outer diameter of the pressure bearing slide plate 4-1 is the same as the inner diameter of the stirring tank 1 below the step surface, and the pressure bearing slide plate 4-1 can move up and down in the stirring tank 1. A pressure bearing spring 4-5 is arranged between the pressure bearing slide plate 4-1 and the bottom of the stirring tank 1. A stirrer backflow pipe 3 is arranged between the pressure bearing slide plate 4-1 and the top cover 2. A plurality of horizontal stirring frames are fixed on the stirrer backflow pipe 3. A plurality of stirring vertical rods are slidably arranged on each horizontal stirring frame. Limiting plates are fixed on the upper and lower ends of the plurality of stirring vertical rods. The distance between the two limiting plates is greater than the height of the horizontal stirring frame. The limiting plate at the lower end of the stirring vertical rod is slidably arranged on the pressure bearing slide plate 4-1.

[0048] The upper part of the backflow pipe 3 is connected to the top cover 2. The top of the backflow pipe 3 is closed, and the bottom is open. A plurality of backflow openings 3-1 are uniformly arranged on the backflow pipe 3. The backflow controller 4 is connected to the backflow pipe 3. The lower end of the backflow pipe 3 extends out of the bottom of the stirring tank. The backflow controller 4 is arranged at the bottom of the stirring tank 1.

[0049] The backflow controller 4 further comprises a motor 4-6. The motor 4-6 is fixed on the lower bottom surface of the stirring tank 1 through a hanging support. The output end of the motor 4-6 is connected to a multi-prong rod 4-7. A horizontal pipe 4-8 is slidably arranged on the multi-prong rod 4-7. A friction transmission wheel 4-9 is fixed on the horizontal pipe 4-8. The friction transmission wheel 4-9 is vertically and frictionally connected to a friction disc 3-2 fixed on the lower end of the backflow pipe 3. The horizontal pipe 4-8 is rotationally connected to a pipe frame 4-10. The pipe frame 4-10 is rotationally connected to one end of a push-pull connecting rod 4-11. The other end of the push-pull connecting rod 4-11 is rotationally connected to a horizontal frame plate 4-3. When the sealing slide pipe 4-2 drives the horizontal frame plate 4-3 to move towards the friction disc 3-2, the horizontal frame plate 4-3 drives the friction transmission wheel 4-9 to move towards the center of the friction disc 3-2 through the push-pull connecting rod 4-11.

[0050] A control material helix 5 is rotationally connected in the backflow pipe 3. The upper end of the control material helix 5 is fixedly connected to a rotating rod 6. The rotating rod 6 is rotationally arranged in the through hole of the backflow pipe 3. The upper end of the rotating rod 6 extends out of the upper end of the backflow pipe 3 and is fixedly connected to an upper bevel gear 7. The upper end of the backflow pipe 3 extends out of the top cover 2 and is fixedly connected to a lower bevel gear 8. The lower bevel gear 8 is vertically engaged with the lower end of a linkage bevel gear 9. The linkage bevel gear 9 is fixed on one end of a wheel shaft. The wheel shaft is rotationally arranged on the top cover 2. The upper end of the linkage bevel gear 9 is engaged with the upper bevel gear 7.

[0051] The other end of the wheel shaft is fixed with a rotating disc 10, one end of the oblique connecting rod 11 is rotatably connected with the eccentric position of the rotating disc 10, the other end of the oblique connecting rod 11 is rotatably connected with one end of the lifting hanger 12, the middle part of the lifting hanger 12 is rotatably connected with the rotating rod 6, the upper surface of the top cover 2 is provided with a guide vertical rod 13, the other end of the lifting hanger 12 is slidably connected with the guide vertical rod 13, the rotating sleeve 14 is slidably matched on the rotating rod 6, the convex rib in the rotating sleeve 14 is slidably arranged in the vertical sliding groove on the outer surface of the rotating rod 6, and the rotating sleeve 14 is rotatably arranged on the top cover 2 through the support.

[0052] A control method of the automatic control device for cementing slurry mixing uniformity provided by the embodiment of the present application is described in detail below.

[0053] The backflow pipe 3 is arranged in the mixing tank 1, a plurality of backflow openings 3-1 are uniformly arranged on the backflow pipe 3, and the lower end of the backflow pipe 3 is connected with the cementing slurry mixing tank through the backflow pipe. When the liquid amount of the cementing slurry in the mixing tank 1 is too much, in order to prevent the cement or water from being unable to be continuously added for mixing, the cementing slurry will generate pressure on the backflow controller 4, so that the backflow controller 4 gradually releases the blockage of the plurality of backflow openings 3-1, so that part of the cementing slurry enters the backflow pipe 3 through the plurality of backflow openings 3-1, and is sent back to the inside of the cementing slurry mixing tank through the backflow pipe 3, so that the liquid amount in the mixing tank 1 is always kept within a certain range, and the cementing slurry mixing uniformity is ensured to be within a reasonable range.

[0054] When the cementing slurry reaches the preset amount and gradually increases, pressure is generated on the pressure-bearing sliding plate 4-1, which gradually drives the pressure-bearing sliding plate 4-1 to slide downward on the inner wall of the mixing tank 1, the pressure-bearing sliding plate 4-1 drives the blockage sliding pipe 4-2 to slide downward, and compresses the pressure-bearing spring 4-5, at this time, the blockage sliding pipe 4-2 gradually releases the blockage of the plurality of backflow openings 3-1 on the backflow pipe 3, so that the cementing slurry can enter the backflow pipe 3; because the plurality of backflow openings 3-1 are arranged from top to bottom on the backflow pipe 3, part of the cementing slurry at different horizontal height positions can be backflowed, the backflow uniformity is improved, and the density mixing uniformity is beneficially ensured; the pressure-bearing spring 4-5 plays a role of elastic support, when the cementing slurry is less than the preset amount, the pressure-bearing sliding plate 4-1 and the blockage sliding pipe 4-2 return to the original position under the elastic force of the pressure-bearing spring 4-5.

[0055] When the blocking slide pipe 4-2 drives the cross frame plate 4-3 to move towards the friction disc 3-2, the cross frame plate 4-3 drives the friction transmission wheel 4-9 to move towards the center of the friction disc 3-2 through the push-pull connecting rod 4-11. The motor 4-6 drives the multi-prong rod 4-7 to rotate, the multi-prong rod 4-7 drives the friction transmission wheel 4-9 to rotate through the horizontal pipe 4-8, the friction transmission wheel 4-9 drives the friction disc 3-2 to rotate through friction transmission, the friction disc 3-2 drives the reflux pipe 3 to rotate, the reflux pipe 3 drives multiple horizontal stirring frames to stir the cement slurry in the stirring tank 1, and the multiple horizontal stirring frames rotate to drive multiple stirring vertical rods and limiting plates to move, thereby improving the uniformity of the cement slurry mixing and stirring and the density adjustment effect of the cement slurry; and the reflux pipe 3 rotates to change the positions of the multiple reflux ports 3-1 on the reflux pipe 3, thereby facilitating the formation of a cyclone and further improving the adjustment effect.

[0056] When the cement slurry in the stirring tank 1 gradually increases, the pressure-bearing sliding plate 4-1 drives the blocking slide pipe 4-2 to slide downward at a gradually increasing amplitude, the blocking slide pipe 4-2 drives the cross frame plate 4-3 to move downward at a gradually increasing distance, and the cross frame plate 4-3 drives the friction transmission wheel 4-9 to move towards the center of the friction disc 3-2 through the push-pull connecting rod 4-11. At this time, the friction transmission wheel 4-9 drives the friction disc 3-2 to rotate at an increasing number of revolutions per revolution of the friction transmission wheel 4-9, the reflux pipe 3 drives the multiple horizontal stirring frames to stir the cement slurry in the stirring tank 1 at an increasing speed, and the stirring speed is automatically adjusted according to different liquid amounts, thereby better satisfying the stirring and mixing effect of the cement slurry with different liquid amounts.

[0057] When the reflux pipe 3 rotates, the lower bevel gear 8 also rotates to drive the linkage bevel gear 9 to rotate and drive the upper bevel gear 7 to rotate through the linkage bevel gear 9. The rotating direction of the upper bevel gear 7 is opposite to that of the lower bevel gear 8. The upper bevel gear 7 drives the rotating rod 6 to rotate through the rotating sleeve pipe 14, and the rotating rod 6 drives the material control spiral body 5 to rotate in the reflux pipe 3. The material control spiral body 5 cooperates with the reflux pipe 3 to improve the reflux effect of the cement slurry and prevent the reflux cement slurry from being blocked in the reflux pipe 3. Multiple liquid passage holes are uniformly arranged on the material control spiral body 5, so that the liquid pump at the lower end of the reflux pipe can effectively pump out the reflux cement slurry and improve the pumping effect. When the linkage bevel gear 9 rotates, the rotating disc 10 rotates through the wheel shaft, the rotating disc 10 drives one end of the inclined connecting rod 11 to rotate and rotate around, the other end of the inclined connecting rod 11 drives the lifting hanger 12 to slide up and down on the guide vertical rod 13, and the lifting hanger 12 slides up and down to drive the rotating rod 6 to slide up and down in the reflux pipe 3 and the rotating sleeve pipe 14. The rotating rod 6 drives the material control spiral body 5 to move up and down in the reflux pipe 3, effectively pushes and presses the reflux cement slurry in the reflux pipe 3, and prevents the reflux cement slurry from being blocked.

[0058] The above merely illustrates the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the present application.

Claims

1. An automatic control device for the uniformity of cement slurry mixing in well cementing, characterized in that, It includes a mixing tank (1), a mixing device, a reflux pipe (3), a pressure plate (4-1), and a reflux controller (4); The pressure-bearing slide plate (4-1) is located at the lower part of the mixing tank (1) and can move under the action of gravity. A spring is provided between the pressure-bearing slide plate (4-1) and the mixing tank (1). The stirring device includes a return pipe (3) and stirring blades disposed thereon. A sealing slide pipe (4-2) is disposed at the center of the pressure plate (4-1) and extends downward. The stirring blades are disposed at the top of the pressure plate (4-1). The return pipe (3) is provided with multiple return holes and is located below the stirring blades. The return pipe (3) is sleeved in the sealing slide pipe (4-2). The sealing slide pipe (4-2) can close or open the return holes (3-1) by moving up and down. The reflux controller includes a drive device and a driven device. The drive device and the driven device are located at the bottom of the mixing tank and are connected to the sealing slide tube (4-2) and the reflux tube (3) respectively. When the sealing slide tube (4-2) moves down, the drive device and the driven device can be combined to make the mixing device rotate.

2. The automatic control device for the uniformity of cement slurry mixing according to claim 1, characterized in that, The multiple reflux holes are spaced apart from top to bottom.

3. The automatic control device for the uniformity of cement slurry mixing according to claim 1, characterized in that, The lower ends of the reflux pipe and the sealing slide pipe (4-2) pass through the bottom of the mixing tank, and the lower end of the reflux pipe extends into the lower end of the sealing slide pipe (4-2). The driving device is connected to the lower end of the sealing slide pipe (4-2), and the driven device is connected to the lower end of the reflux pipe.

4. The automatic control device for the uniformity of cement slurry mixing according to claim 1, characterized in that, The drive device includes a motor, a friction drive wheel, and a push-pull linkage; The motor is fixed at the bottom of the mixing tank, the friction drive wheel is sleeved on the output shaft of the motor and can move axially, the lower end of the sealing slide tube (4-2) is fixed with a cross plate, one end of the push-pull connecting rod is connected to the end of the cross plate, and the other end of the push-pull connecting rod is connected to the friction drive wheel through the cross tube. The driven device includes a friction disc, which is disposed at the lower end of the return pipe (3).

5. The automatic control device for the uniformity of cement slurry mixing according to claim 1, characterized in that, The reflux pipe (3) is fitted with a coaxial control screw (5). The upper end of the reflux pipe (3) is rotatably connected to the upper end of the mixing tank. The upper end of the control screw (5) extends out of the reflux pipe (3) and is connected to the reflux pipe (3) through a gear structure.

6. The automatic control device for the uniformity of cement slurry mixing according to claim 5, characterized in that, The gear structure includes a driving gear, a transmission gear and a driven gear. The driving gear is fixed to the upper end of the return pipe, and the driven gear is fixed to the material control screw (5). The driving gear meshes with the driven gear through the transmission gear.

7. The automatic control device for the uniformity of cement slurry mixing according to claim 6, characterized in that, The top of the stirring arm is also equipped with a lifting device, which is connected to the material control auger (5).

8. The automatic control device for the uniformity of cement slurry mixing according to claim 7, characterized in that, The lifting device includes an inclined connecting rod (11), a guide vertical rod (13), and a lifting frame (12); The lifting frame is rotatably connected to the material control auger (5), one end of the lifting frame is slidably connected to the guide vertical rod (13), the other end of the lifting frame is rotatably connected to one end of the inclined connecting rod (11), and the other end of the inclined connecting rod (11) is eccentrically connected to the transmission gear.

9. The automatic control device for the uniformity of cement slurry mixing according to claim 1, characterized in that, The mixing tank (1) is equipped with a feed pipe and a discharge pipe, and is located on the upper part of the pressure plate (4-1).

10. The automatic control device for the uniformity of cement slurry mixing according to claim 1, characterized in that, The bottom of the stirring blade is provided with a limiting plate, which slides on the pressure-bearing slide plate (4-1).

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