A raw material proportioning process and equipment for producing low-density oil well cement

Abstract

The present invention relates to the field of cement production, and in particular to a raw material proportioning process and equipment for low-density oil well cement production. The proportioning equipment includes a loading rack, a storage bin, a proportioning barrel, and a mixing box. The storage bin is evenly installed on the top of the loading rack, and the bottom of the loading rack is fixedly connected to the mixing box through a support frame. The proportioning barrel is arranged between the bottom of the loading rack and the top of the mixing box. A fixed material tray is fixedly arranged in the loading rack, and a plurality of discharge cavities are evenly arranged at the bottom of the fixed material tray. A feed port corresponding to the discharge cavities is arranged at the top of the fixed material tray. Different numbers of feed holes are arranged throughout the feed port according to the ratio of each raw material. A first loading plate is rotatably installed in the fixed material tray. The present invention can use distance changes and change differences to accurately detect the discharge amount of each raw material and the proportion of each raw material, thereby realizing a precise proportioning process for different raw materials and effectively improving proportioning efficiency and proportioning accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of cement production, in particular to a raw material proportioning process and equipment for producing low-density oil well cement. Background Art

[0002] Oil well cement, also known as plugging cement, is specifically used for cementing oil and gas wells. Its primary function is to bond the casing to the surrounding rock formation, isolating the oil, gas, and water layers within the formation and preventing crosstalk. This creates a well-insulated oil flow path from the oil layer to the surface. Oil well cement is a specialty cement made from Portland cement clinker, primarily hydraulic calcium silicate, ground with an appropriate amount of gypsum and grinding aids.

[0003] During the production process of oil-well cement, raw materials must be carefully proportioned according to their respective weights. Current proportioning methods typically use weighing equipment to manually weigh a specific amount of raw materials, then add all the ingredients to a mixing tank for mixing. However, this method cannot precisely control the amount of each raw material added during weighing, nor can it calibrate the weight ratios of the raw materials after weighing. Therefore, the accuracy of the proportioning process still needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a raw material proportioning process and equipment for producing low-density oil well cement, aiming to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A raw material proportioning equipment for low-density oil well cement production includes a loading rack, a storage bin, a proportioning drum and a mixing box, the storage bin is evenly installed on the top of the loading rack, the bottom end of the loading rack is fixedly connected to the mixing box through a support frame, the proportioning drum is arranged between the bottom of the loading rack and the top of the mixing box, a fixed material tray is fixedly arranged in the loading rack, a plurality of discharge cavities are evenly arranged at the bottom of the fixed material tray, a feed port corresponding to the discharge cavities is arranged at the upper end of the fixed material tray, a different number of feed holes are arranged through the feed port according to the ratio of each raw material, a first loading plate is rotatably installed in the fixed material tray, a second loading plate is rotatably installed in the first loading plate, the first loading plate is used to control all feed ports to load materials at the same time, and the second loading plate is used for single feeding of a single feed port.

[0007] The interior of the proportioning cylinder is evenly divided into several quantitative chambers by partitions, and the quantitative chambers are connected with the corresponding discharge chambers through discharge pipes. A sliding baffle is sealed and slidably installed in the quantitative chamber, and a discharge pipe is fixedly connected to the bottom of the sliding baffle. The bottom of the discharge pipe slides through the proportioning cylinder and extends into the mixing box. A displacement sensor is fixedly provided at the bottom of the proportioning cylinder, and an induction pad corresponding to the displacement sensor is fixedly provided at the bottom of the proportioning cylinder.

[0008] As a further solution of the present invention: a return spring is provided between the bottom of the sliding baffle and the proportioning cylinder, an electric valve for controlling the opening and closing of the discharge pipe is provided at the upper end of the sliding baffle, and the displacement sensor is communicatively connected with the corresponding electric valve.

[0009] As a further solution of the present invention: a first motor is fixedly installed at the center of the upper end of the loading rack, the output end of the first motor is fixedly connected to the first loading plate, and the first loading plate is evenly penetrated with first loading holes, and the first loading holes are arranged in a one-to-one correspondence with the feed port.

[0010] As a further solution of the present invention: a movable cavity is provided inside the first loading plate, a pivot is fixedly provided in the center of the movable cavity, the second loading plate is rotatably installed in the movable cavity, the pivot is rotatably coordinated with the center of the second loading plate, a synchronous gear is provided at the upper end of the second loading plate, a second motor is fixedly provided at the upper end of the first loading plate, a driving gear is connected to the output end of the second motor, and the driving gear is meshed with the synchronous gear.

[0011] As a further solution of the present invention: a plurality of discharge parts are evenly arranged on the second loading plate, and a blocking part is formed between two adjacent discharge parts. The discharge part is used to open and connect the first discharge hole, and the blocking part is used to block and close the first discharge hole, and a second discharge hole is penetrated by one of the blocking parts.

[0012] As a further solution of the present invention: an escape opening is provided at the upper end of the fixed material tray, and the second motor rotates in the escape opening along with the first loading plate.

[0013] As a further solution of the present invention: a stirring motor is fixedly installed at the bottom of the stirring box, the output end of the stirring motor is connected to a stirring shaft, a plurality of stirring rods are evenly arranged on the side wall of the stirring shaft, and stirring blades are arranged at intervals along the axial direction on the outer wall of the stirring rod.

[0014] As a further solution of the present invention: one end of the stirring rod rotates with the stirring shaft through a rotating shaft, and induction magnetic blocks are fixedly provided on the upper and lower surfaces of the other end of the stirring rod, and the magnetic poles of the two induction magnetic blocks are opposite.

[0015] As a further solution of the present invention: a plurality of drive seats are evenly spaced on the inner wall of the mixing box, the induction magnetic block passes through the drive seat, and drive magnetic blocks are fixedly provided at the upper and lower ends of the drive seat. The magnetic poles of the two drive magnetic blocks are opposite, and the magnetic poles of the drive magnetic blocks at the upper and lower ends of two adjacent drive seats are also opposite.

[0016] The present invention also provides a raw material proportioning process for producing low-density oil well cement, which uses the above-mentioned raw material proportioning equipment for producing low-density oil well cement, and includes the following steps:

[0017] Step 1: Prepare the raw materials. According to the different number of feed holes on each feed port, add the corresponding proportions of raw materials into different storage bins according to the raw material ratio, and start preparing for loading.

[0018] Step 2: Preliminary feeding ratio. Control the rotation of the first feeding plate so that all feeding holes are open. Different raw materials enter the quantitative cavity through the feeding pipe and press the sliding baffle downward. The distance change between the displacement sensor and the sensing pad is monitored to accurately detect the feeding amount of each raw material and the ratio of each raw material.

[0019] Step three, finely adjust the ratio. According to the detected ratio between the raw materials, when a certain raw material is lacking, control the second feeding plate to rotate so that the raw material is fed separately until the raw material reaches the ratio component.

[0020] Step 4: Feed and mix the raw materials. The raw materials with good proportions are fed into the mixing box through the discharge pipe and are fully stirred and mixed in the mixing box.

[0021] Beneficial effects of the present invention:

[0022] (1) By setting a fixed material tray, a first loading plate and a second loading plate, since the ratio of the number of feeding holes in different feeding ports corresponds to the ratio of different raw materials, when loading, raw materials with corresponding ratios are added to different storage bins. When the first loading plate is controlled to rotate and start loading at the same time, the loading rate of different raw materials through the feeding holes will also be proportional to the ratio of each raw material. Therefore, the loading amount of each raw material can be preliminarily controlled by controlling the loading speed, and the loading time of each raw material entering the quantitative chamber can be kept consistent, which is conducive to the precise ratio of raw materials.

[0023] (2) By setting up a proportioning cylinder, when the raw materials enter the interior of the quantitative chamber, the raw materials will be supported by the sliding baffle, which will press the discharge pipe downward to make it slide downward. The displacement sensor is used to monitor the distance change between the discharge pipe and the sensing pad in real time. The displacement distance detected by the raw materials with different weight ratios will also form a corresponding ratio, so that the distance change and the difference in change can be used to accurately detect the discharge amount of each raw material and the proportion of each raw material. When a certain raw material is missing, the second loading plate is controlled to rotate so that the raw material is loaded separately until the specified proportion is reached, thereby realizing the precise proportioning process of different raw materials and effectively improving the proportioning efficiency and proportioning accuracy.

[0024] (3) When the proportioned raw materials enter the mixing box, the mixing motor starts and drives the mixing rod to rotate circumferentially through the mixing shaft. During this process, the induction magnetic block at the end of the mixing rod will pass through the drive seat. By utilizing the repulsion of the same magnetic poles and the attraction of the opposite magnetic poles, the mixing rod will be flipped in the drive seat. When it continues to pass through the next drive seat, since the magnetic poles of the driving magnetic blocks at the upper and lower ends of the adjacent drive seats are opposite, the mixing rod can be driven to flip again. As the mixing rod continues to rotate horizontally, it will flip around the axis every time it passes through the drive seat, so that the mixing rod can continue to rotate while revolving around the axis. In combination with the mixing fan blades, the stirring effect of the raw materials will be greatly improved, so that the raw materials can be fully mixed and evenly mixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the bottom structure of the loading rack in the present invention.

[0028] Figure 3 It is a schematic diagram of the internal structure of the loading rack in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the fixed material tray in the present invention.

[0030] Figure 5 It is a structural schematic diagram of the first loading plate in the present invention.

[0031] Figure 6 It is a structural schematic diagram of the second feeding plate in the present invention.

[0032] Figure 7 It is a structural schematic diagram of the proportioning cylinder in the present invention.

[0033] Figure 8 It is a schematic diagram of the internal structure of the proportioning cylinder in the present invention.

[0034] Figure 9 It is a schematic diagram of the internal structure of the mixing box in the present invention.

[0035] Figure 10 It is a structural schematic diagram of the stirring rod in the present invention.

[0036] In the figure: 1. Loading rack; 11. Support frame; 12. Fixed material tray; 121. Feeding chamber; 122. Feeding port; 123. Feeding hole; 124. Avoidance port; 13. First loading plate; 131. Movable chamber; 132. Pivot; 133. First feeding hole; 14. Second loading plate; 141. Synchronous gear; 142. Discharge part; 143. Blocking part; 144. Second feeding hole; 15. First motor; 16. Second motor; 161. Drive Gear; 2. Storage silo; 3. Proportioning cylinder; 31. Partition; 32. Metering chamber; 321. Feeding tube; 33. Sliding baffle; 331. Return spring; 332. Electric valve; 34. Discharge pipe; 341. Displacement sensor; 342. Induction pad; 4. Mixing box; 41. Mixing motor; 42. Mixing shaft; 43. Mixing rod; 431. Mixing blade; 432. Rotating shaft; 433. Induction magnet; 44. Drive seat; 441. Drive magnet. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0038] See also Figures 1-4 As shown, the present invention is a raw material proportioning equipment for low-density oil well cement production, including a loading rack 1, a storage bin 2, a proportioning drum 3 and a mixing box 4. The storage bin 2 is evenly installed on the top of the loading rack 1, and the bottom end of the loading rack 1 is fixedly connected to the mixing box 4 through a support frame 11. The proportioning drum 3 is arranged between the bottom of the loading rack 1 and the top of the mixing box 4. A fixed material tray 12 is fixedly arranged in the loading rack 1, and a plurality of discharge cavities 121 are evenly arranged at the bottom of the fixed material tray 12. A feeding port 122 corresponding to the discharge cavities 121 is arranged at the upper end of the fixed material tray 12, and a different number of feeding holes 123 are arranged through the feeding port 122 according to the ratio of each raw material. A first loading plate 13 is rotatably installed in the fixed material tray 12, and a second loading plate 14 is rotatably installed in the first loading plate 13. The first loading plate 13 is used to control all the feeding ports 122 to load materials at the same time, and the second loading plate 14 is used for a single feeding port 122 to load materials separately.

[0039] Specifically, by setting a fixed material tray 12, a first loading plate 13 and a second loading plate 14, since the ratio of the number of feed holes 123 in different feed ports 122 corresponds to the ratio of different raw materials, when loading, raw materials with corresponding proportions are added to different storage bins 2. When the first loading plate 13 is controlled to rotate and start loading at the same time, the loading rate of different raw materials through the feed holes 123 will also be proportional to the proportion of each raw material. Therefore, the loading amount of each raw material can be preliminarily controlled by controlling the loading speed, and the loading time of each raw material entering the quantitative cavity 32 can be kept consistent, which is conducive to the precise ratio of raw materials.

[0040] like Figure 7 and Figure 8 As shown, the interior of the proportioning cylinder 3 is evenly divided into several quantitative chambers 32 by the partition 31. The quantitative chamber 32 is connected with the corresponding discharge chamber 121 through the discharge pipe 321. A sliding baffle 33 is sealed and slidably installed in the quantitative chamber 32. The bottom of the sliding baffle 33 is fixedly connected to a discharge pipe 34. The bottom of the discharge pipe 34 slides through the proportioning cylinder 3 and extends into the mixing box 4. A displacement sensor 341 is fixedly provided at the bottom of the discharge pipe 34. The bottom of the proportioning cylinder 3 is fixedly provided with an induction pad 342 corresponding to the displacement sensor 341.

[0041] Specifically, by setting up the proportioning cylinder 3, when the raw materials enter the interior of the quantitative chamber 32, the sliding baffle 33 will carry the raw materials, and the sliding baffle 33 will press the discharge pipe 34 downward to make it slide downward. The displacement sensor 341 is used to monitor the distance change between the sensing pad 342 in real time. The displacement distance detected for raw materials with different weight proportions will also form a corresponding ratio, so that the distance change and the change difference can be used to accurately detect the discharge amount of each raw material and the proportion of each raw material. When a certain raw material is missing, the second loading plate 14 is controlled to rotate so that the raw material is loaded separately until the specified proportion is reached, thereby realizing the precise proportioning process of different raw materials and effectively improving the proportioning efficiency and proportioning accuracy.

[0042] like Figure 1 and Figure 8 As shown, a return spring 331 is provided between the bottom of the sliding baffle 33 and the proportioning cylinder 3, and an electric valve 332 for controlling the opening and closing of the discharge pipe 34 is provided at the upper end of the sliding baffle 33. The displacement sensor 341 is communicated with the corresponding electric valve 332.

[0043] Specifically, during the feeding process, the raw materials on the sliding baffle 33 continue to increase, and the sliding baffle 33 will slide downward and squeeze the reset spring 331. During this process, the electric valve 332 is always closed to prevent the raw materials from leaking. When the descending movement distance of all the discharge pipes 34 reaches the specified value, it means that all the raw materials have reached the specified discharge amount and the proportion of each raw material meets the ratio standard. At this time, the displacement sensor 341 sends a control signal to the electric valve 332, so that the electric valve 332 opens, and the raw materials in the quantitative chamber 32 will enter the mixing box 4 through the discharge pipe 34.

[0044] It should be noted that after loading is completed, the sliding baffles 33 will slide upward and return to their original position under the elastic force of the return spring 331. To ensure the accuracy of the quantitative ratio, all sliding baffles 33 should remain on the same horizontal plane in the initial state. The displacement sensor 341 is used to monitor whether the initial distance between the sliding baffles 33 and the sensing pad 342 is consistent, thereby detecting and correcting the initial position of the sliding baffles 33.

[0045] like Figure 3 、 Figure 4 and Figure 5 As shown, a first motor 15 is fixedly provided at the center of the upper end of the loading rack 1, and the output end of the first motor 15 is fixedly connected to the first loading plate 13. First discharge holes 133 are evenly provided on the first loading plate 13, and the first discharge holes 133 are provided in a one-to-one correspondence with the feed port 122.

[0046] Specifically, the first motor 15 is started, driving the first loading plate 13 to rotate until the first discharge hole 133 is aligned with each corresponding feed port 122. At this time, the raw material in the feed port 122 can be connected to the first discharge hole 133 through the feed hole 123 to achieve a synchronous loading process.

[0047] like Figure 3 、 Figure 5 and Figure 6 As shown, a movable cavity 131 is provided inside the first loading plate 13, and a pivot 132 is fixedly provided in the center of the movable cavity 131. The second loading plate 14 is rotatably installed in the movable cavity 131, and the pivot 132 is rotatably coordinated with the center of the second loading plate 14. A synchronous gear 141 is provided at the upper end of the second loading plate 14, and a second motor 16 is fixedly provided at the upper end of the first loading plate 13. The output end of the second motor 16 is connected to a driving gear 161, and the driving gear 161 is meshed with the synchronous gear 141.

[0048] like Figure 5 and Figure 6As shown, a plurality of discharge portions 142 are evenly provided on the second loading plate 14, and a blocking portion 143 is formed between two adjacent discharge portions. The discharge portion 142 is used to open and connect the first discharge hole 133, and the blocking portion 143 is used to block and close the first discharge hole 133, and a second discharge hole 144 is provided on one of the blocking portions 143.

[0049] Specifically, when the first discharge hole 133 is discharges normally, each discharge part 142 is aligned with the corresponding first discharge hole 133, so that the discharge hole is open and connected, and when the second motor 16 drives the synchronous gear 141 to rotate through the driving gear 161, the synchronous gear 141 will drive the second loading plate 14 to rotate until the blocking part 143 blocks and closes the first discharge hole 133. At this time, the feed port 122 and the first discharge hole 133 are still connected, and the second discharge hole 144 will remain connected with one of the first discharge holes 133, and the remaining first discharge holes 133 will be closed by the blocking part 143, thereby realizing the separate discharge process of a certain raw material.

[0050] like Figure 4 As shown, an escape opening 124 is provided at the upper end of the fixed material tray 12 , and the second motor 16 rotates in the escape opening 124 along with the first loading plate 13 .

[0051] Specifically, when the first loading plate 13 rotates internally relative to the fixed tray 12 , the avoidance opening 124 provides sufficient rotational space for the second motor 16 , so that the second motor 16 can rotate freely along with the first loading plate 13 .

[0052] like Figure 9 and Figure 10 As shown, a stirring motor 41 is fixedly installed at the bottom of the stirring box 4, and the output end of the stirring motor 41 is connected to a stirring shaft 42. A number of stirring rods 43 are evenly arranged on the side wall of the stirring shaft 42, and stirring blades 431 are arranged at intervals along the axial direction on the outer wall of the stirring rod 43.

[0053] Furthermore, one end of the stirring rod 43 is rotatably engaged with the stirring shaft 42 via a rotating shaft 432 , and induction magnetic blocks 433 are fixedly provided on the upper and lower surfaces of the other end of the stirring rod 43 , and the magnetic poles of the two induction magnetic blocks 433 are opposite.

[0054] Furthermore, a number of drive seats 44 are evenly spaced on the inner wall of the mixing box 4, and the induction magnetic block 433 passes through the drive seat 44. The upper and lower ends of the drive seat 44 are fixed with drive magnetic blocks 441. The magnetic poles of the two drive magnetic blocks 441 are opposite, and the magnetic poles of the drive magnetic blocks 441 at the upper and lower ends of two adjacent drive seats 44 are also opposite.

[0055] Specifically, when the well-proportioned raw materials enter the mixing box 4, the mixing motor 41 is started, and the mixing rod 43 will be driven to rotate circumferentially through the mixing shaft 42. During this process, the induction magnetic block 433 at the end of the mixing rod 43 will pass through the drive seat 44. By utilizing the repulsion of like magnetic poles and the attraction of opposite magnetic poles, the mixing rod 43 will be flipped in the drive seat 44. When it continues to pass through the next drive seat 44, since the magnetic poles of the driving magnetic blocks 441 at the upper and lower ends of the adjacent drive seats 44 are opposite, the mixing rod 43 can be driven to flip again. As the mixing rod 43 continues to rotate horizontally, it will flip around the axis every time it passes through the drive seat 44, so that the mixing rod 43 can continue to rotate while revolving around the axis. Cooperating with the mixing fan blades 431, the stirring effect on the raw materials will be greatly improved, so that the raw materials can be fully mixed and evenly mixed.

[0056] The working principle of the above device is as follows: Figures 1-10 As shown, when in use, first, according to the different number of feed holes 123 on each feed port 122, the corresponding proportion of raw materials is added to different storage bins 2 according to the raw material ratio, and the first motor 15 drives the first loading plate 13 to rotate until the first discharge hole 133 is aligned with each corresponding feed port 122, and the materials are loaded simultaneously. The loading rate of different raw materials through the feed holes 123 will also be proportional to the proportion of each raw material, so that the loading amount of each raw material can be preliminarily controlled by controlling the loading speed, and the loading time of each raw material entering the quantitative chamber 32 is kept consistent. When the raw material enters the interior of the quantitative chamber 32, the raw material will be carried by the sliding baffle 33, which will press the discharge pipe 34 downward to make it slide downward, and the displacement sensor 341 will monitor the distance change between the sensor pad 342 in real time. The displacement distance detected by the raw materials of different weight proportions will also form a corresponding ratio, so that the distance change and the difference in change can be used to accurately detect the discharge amount of each raw material and the proportion of each raw material. When a certain raw material is lacking, the second motor 16 drives the synchronous gear 141 to rotate through the driving gear 161, and the synchronous gear 141 will drive the second loading plate 14 to rotate until the blocking portion 143 blocks and closes the first discharge hole 133. At this time, the feed port 122 and the first discharge hole 133 are still connected, and the second discharge hole 144 will be connected to one of the first discharge holes 133. The remaining first discharge holes 133 will be closed by the blocking portion 143, thereby controlling the separate discharge of a certain raw material until the specified proportion is reached, realizing the precise proportioning process of different raw materials. When the well-proportioned raw materials enter the mixing box 4, the stirring motor 41 is started, and the stirring rod 43 can continue to rotate while revolving around the axis. Cooperating with the stirring blades 431 will greatly improve the stirring effect of the raw materials, so that each raw material can be fully mixed and evenly mixed.

[0057] The present invention also provides a raw material proportioning process for producing low-density oil well cement, which uses the above-mentioned raw material proportioning equipment for producing low-density oil well cement, and includes the following steps:

[0058] Step 1: prepare the raw materials. According to the different numbers of feed holes 123 on each feed port 122, add the raw materials in corresponding proportions into different storage bins 2 according to the raw material ratio, and start preparing for loading.

[0059] Step 2: Preliminary feeding ratio: control the first feeding plate 13 to rotate so that all the feed holes 123 are opened. Different raw materials enter the quantitative cavity 32 through the feeding tube 321 and press the sliding baffle 33 downward. The distance change between the displacement sensor 341 and the sensing pad 342 is monitored, so as to accurately detect the feeding amount of each raw material and the ratio of each raw material.

[0060] Step three, finely adjust the ratio. According to the detected ratio between the raw materials, when a certain raw material is lacking, control the second feeding plate 14 to rotate so that the raw material is fed separately until the raw material reaches the ratio component.

[0061] Step 4: feeding and stirring. The raw materials with good proportions are introduced into the stirring box 4 through the discharge pipe 34 and are fully stirred and mixed in the stirring box 4.

[0062] It should be noted that the mix ratio of low-density oil well cement needs to be adjusted according to the specific application scenario, well depth and performance requirements. The following are specific instructions:

[0063] Low-density oil well cement is a special cement used for cementing operations in oil and natural gas wells. Its production raw materials are as follows:

[0064] Cement clinker: It is mainly made from limestone, clay, iron ore and coal through high temperature calcination. It is the main gelling component of cement.

[0065] Admixtures: Commonly used materials include fly ash, slag, silica fume, etc. They can reduce the density of cement and improve its properties, such as increasing the later strength of cement paste and the fluidity of cement slurry;

[0066] Gypsum: Its main function is to adjust the setting time of cement. Generally, natural gypsum or industrial by-product gypsum is used.

[0067] The raw material ratio is as follows: cement clinker usually accounts for about 60%-80%, the amount of admixture is generally 20%-40%, of which fly ash can account for 30%-70% of the total admixture, slag accounts for 20%-50%, silica fume accounts for 5%-15%, and the gypsum content is generally 3%-5% of the cement mass.

[0068] The production of low-density oil-well cement involves raw material preparation, raw material preparation, clinker calcination, cement grinding, and packaging. Various raw materials are accurately measured according to the designed formula and fed into high-efficiency mixing equipment for thorough mixing to ensure uniformity. Raw materials undergo pretreatment, batching, grinding, homogenization, and packaging before being manufactured into finished low-density oil-well cement. Throughout the entire production process, product quality is rigorously tested and controlled at every stage.

[0069] The above is the general situation of low-density oil well cement production. In actual production, the raw material ratio and production process may vary depending on factors such as the manufacturer and product performance requirements.

[0070] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A raw material proportioning device for low-density oil well cement production, comprising a loading rack (1), a storage bin (2), a proportioning cylinder (3) and a mixing box (4), characterized in that: The storage bin (2) is evenly mounted on the top of the loading rack (1). The bottom of the loading rack (1) is fixedly connected to the mixing box (4) through a support frame (11). The proportioning cylinder (3) is arranged between the bottom of the loading rack (1) and the top of the mixing box (4). A fixed material tray (12) is fixedly arranged in the loading rack (1). A plurality of discharge cavities (121) are evenly arranged at the bottom of the fixed material tray (12). The upper end of the fixed material tray (12) is provided with a plurality of discharge cavities (121) that are aligned with the discharge cavities (121). A corresponding feed port (122) is provided with different numbers of feed holes (123) in accordance with the ratio of each raw material in the feed port (122); a first loading plate (13) is rotatably mounted in the fixed material tray (12); a second loading plate (14) is rotatably mounted in the first loading plate (13); the first loading plate (13) is used to control all the feed ports (122) to load materials simultaneously, and the second loading plate (14) is used to load materials separately at a single feed port (122); The interior of the proportioning cylinder (3) is evenly divided into a plurality of quantitative chambers (32) by a partition (31), and the quantitative chamber (32) is connected to the corresponding discharge chamber (121) through a discharge pipe (321). A sliding baffle (33) is sealed and slidably installed in the quantitative chamber (32), and a discharge pipe (34) is fixedly connected to the bottom of the sliding baffle (33). The bottom of the discharge pipe (34) slides through the proportioning cylinder (3) and extends into the mixing box (4). A displacement sensor (341) is fixedly provided at the bottom end of the discharge pipe (34), and a sensing pad (342) corresponding to the displacement sensor (341) is fixedly provided at the bottom of the proportioning cylinder (3); A first motor (15) is fixedly provided at the center of the upper end of the loading rack (1), an output end of the first motor (15) is fixedly connected to a first loading plate (13), first unloading holes (133) are evenly provided on the first loading plate (13), and the first unloading holes (133) are provided in a one-to-one correspondence with the feed port (122); A movable cavity (131) is provided inside the first loading plate (13), a pivot (132) is fixedly provided at the center of the movable cavity (131), the second loading plate (14) is rotatably mounted in the movable cavity (131), the pivot (132) is rotatably matched with the center of the second loading plate (14), a synchronous gear (141) is provided at the upper end of the second loading plate (14), a second motor (16) is fixedly provided at the upper end of the first loading plate (13), an output end of the second motor (16) is connected to a driving gear (161), and the driving gear (161) is meshed with the synchronous gear (141); A plurality of discharge portions (142) are evenly provided on the second loading plate (14), and a blocking portion (143) is formed between two adjacent discharge portions. The discharge portion (142) is used to open and connect the first discharge hole (133), and the blocking portion (143) is used to block and close the first discharge hole (133). A second discharge hole (144) is provided on one of the blocking portions (143).

2. The raw material proportioning equipment for producing low-density oil well cement according to claim 1, characterized in that: A return spring (331) is provided between the bottom of the sliding baffle (33) and the proportioning cylinder (3), an electric valve (332) for controlling the opening and closing of the discharge pipe (34) is provided at the upper end of the sliding baffle (33), and the displacement sensor (341) is communicatively connected to the corresponding electric valve (332).

3. The raw material proportioning equipment for producing low-density oil well cement according to claim 1, characterized in that: An escape opening (124) is provided at the upper end of the fixed material tray (12), and the second motor (16) rotates within the escape opening (124) along with the first loading plate (13).

4. The raw material proportioning equipment for producing low-density oil well cement according to claim 1, characterized in that: A stirring motor (41) is fixedly provided at the bottom of the stirring box (4), an output end of the stirring motor (41) is connected to a stirring shaft (42), a plurality of stirring rods (43) are evenly provided on the side wall of the stirring shaft (42), and stirring blades (431) are provided at intervals along the axial direction on the outer wall of the stirring rod (43).

5. The raw material proportioning equipment for producing low-density oil well cement according to claim 4, characterized in that: One end of the stirring rod (43) is rotatably engaged with the stirring shaft (42) via a rotating shaft (432), and induction magnetic blocks (433) are fixedly provided on the upper and lower surfaces of the other end of the stirring rod (43), and the magnetic poles of the two induction magnetic blocks (433) are opposite.

6. The raw material proportioning equipment for producing low-density oil well cement according to claim 5, characterized in that: A plurality of drive seats (44) are evenly spaced on the inner wall of the mixing box (4), the induction magnetic block (433) passes through the drive seat (44), and drive magnetic blocks (441) are fixedly provided at the upper and lower ends of the drive seat (44), the magnetic poles of the two drive magnetic blocks (441) are opposite, and the magnetic poles of the drive magnetic blocks (441) at the upper and lower ends of two adjacent drive seats (44) are also opposite.

7. A process for proportioning raw materials for producing low-density oil well cement, using the raw material proportioning equipment for producing low-density oil well cement as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Prepare the raw materials. According to the different numbers of feed holes (123) on each feed port (122), add the raw materials in corresponding proportions into different storage bins (2) according to the raw material ratio, and start preparing for loading; Step 2: Preliminary feeding ratio, controlling the first feeding plate (13) to rotate so that all the feeding holes (123) are opened, and different raw materials respectively enter the quantitative cavity (32) through the feeding tube (321) and press the sliding baffle (33) downward, and the distance change between the displacement sensor (341) and the sensing pad (342) is monitored, thereby accurately detecting the feeding amount of each raw material and the ratio of each raw material; Step three, finely adjusting the ratio, according to the detected ratio between the raw materials, when a certain raw material is lacking, controlling the second feeding plate (14) to rotate so that the raw material is fed separately until the raw material reaches the ratio component; Step 4: feeding and stirring. The raw materials with good proportions are introduced into the stirring box (4) through the discharge pipe (34) and are fully stirred and mixed in the stirring box (4).

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