Continuous sand delivery device

Abstract

The application discloses a continuous sand conveying device which mainly comprises horizontal tank groups, vertical tank groups, bag breaking devices, hoisting systems, elevators and distribution valves. Three vertical tanks are arranged on one side of the horizontal tank, two elevators are arranged between the vertical tank groups, and the space on both sides of the elevators is fully utilized. The left vertical tank and the right vertical tank adopt a double-layer tank structure, the proppant in the lower tank is conveyed into the upper tank by the elevator for the second time, and then the proppant is fed to the sand mixing vehicle. The two sets of elevators are connected with the distribution valve, and the proppant is automatically distributed into the tank according to gravity. The application is a supporting equipment of an unconventional oil and gas fracturing unit, can store a large capacity, and can fully seal and convey the proppant with a large flow rate, thereby meeting the application requirements of small well fields and large-scale sand fracturing.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas field fracturing equipment, specifically relating to a continuous sand conveying device. Background Technology

[0002] Unconventional oil and gas development mainly relies on hydraulic fracturing. Fracturing operations require injecting quartz sand or ceramsite of different particle sizes into the formation as proppant in stages. As the scale of fracturing operations continues to expand, the amount of proppant used is also increasing.

[0003] In the early days, fracturing well sites mostly used cylindrical sand tanks with conical bottoms as sand storage and filling devices. The operation involved using a crane to lift sand bags to the top of the tank for opening and filling with sand. Manual operation of the valve at the bottom of the sand tank was then used to add sand to the mixing truck. This method required manual operation of hooking and unhooking sand bags on the ground and at the top of the sand tank, which was up to 10 meters high. This method had problems such as high labor intensity, safety hazards of working at height, and low efficiency of sand storage and transportation.

[0004] In recent years, my country has successively developed continuous sand conveying devices. These devices utilize a three-layer stacked sand tank for storage, automated overhead cranes for low-level hoisting, and a hoist to transport sand to the top of the tank for loading. This technology enables automatic and continuous sand conveying, reducing labor intensity and solving the problem of high-altitude operations. However, with the increasing scale of operations, existing continuous sand conveying devices also have limitations in meeting actual needs. Firstly, existing equipment uses three stacked tanks to form a large sand storage tank. Due to limitations in transport dimensions and total height, the maximum sand storage capacity is 120 cubic meters, while the current single-cycle sand consumption for fracturing is limited. The maximum capacity exceeds 300 cubic meters. Even with full tank loading and simultaneous sand conveying, the existing sand conveying system is insufficient for the amount of sand required for a single fracturing operation. Secondly, proppant loading uses a single hoist to transport the proppant from a low position to the top of the tank, and then a horizontal screw conveyor to the corresponding compartment, or a vertical hoist is moved along a horizontal guide rail to the corresponding feed compartment. This method has low loading efficiency, and when encountering high-intensity sand fracturing, a crane is needed to assist in simultaneously opening the bags from the top of the sand tank for loading. Thirdly, large-scale fracturing well sites have many equipment, and the existing sand conveying system occupies a large area and is difficult to arrange.

[0005] Improving the storage capacity and conveying efficiency of continuous sand conveying devices while reducing the large footprint of the equipment is an urgent problem to be solved. This invention increases the storage capacity by using a combination of horizontal and vertical sand tanks, making full use of the space on both sides of the hoist, resulting in a small footprint. It adopts two sets of hoisting, bag breaking and conveying systems, and the distribution valve relies on gravity for automatic material feeding. This technical solution achieves the goal of increasing sand storage capacity and conveying efficiency, meeting the current demand for large-capacity storage and conveying of unconventional oil and gas fracturing proppant. Summary of the Invention

[0006] The purpose of this invention is to provide a continuous sand conveying device, which solves the technical problems of large footprint and low conveying efficiency in existing sand conveying devices.

[0007] The technical solution adopted in this invention is: a continuous sand conveying device, comprising:

[0008] The system consists of horizontal tank units and vertical tank units. The vertical tank units are arranged on one side of the horizontal tank units and connected to them, together forming a storage chamber for fracturing quartz sand and proppant. The vertical tank units and horizontal tank units together form a single chamber to meet the storage requirements of various proppants.

[0009] The bag breaking device is located at the bottom of the vertical tank group. The bag breaking device integrates a hoisting operation room and a bag breaking hopper, which are used for hoisting and observing the proppant bags and breaking the bags, respectively.

[0010] The hoisting system is located above the bag-breaking device and connected to the top of the vertical tank assembly. It is used to hoist the proppant from the ground to the bag-breaking hopper of the bag-breaking device for bag breaking and unloading.

[0011] The elevator is installed between the three tanks of the vertical tank group and connected to the horizontal tank group. The bottom of the elevator is connected to the transition bucket of the bag breaking device, and the top is connected to the distribution valve group. It is used for vertical sand conveying of proppant. The elevator is a bucket elevator, and the bucket sprocket tensioning method of the elevator is spring tensioning.

[0012] The distribution valve assembly is located at the top of the horizontal and vertical tank groups and connected to the discharge port of the elevator. The distribution valve assembly is used to control the addition of proppant to one or more compartments of the horizontal and vertical tank groups.

[0013] The electrical control system is installed at the bottom of the horizontal tank group and is used for powering the equipment and controlling each actuator.

[0014] The common base consists of interconnected steel structure flat panels, with at least one panel in total, which together form a support platform for other equipment.

[0015] The invention is further characterized in that,

[0016] The vertical tank assembly consists of three independent tanks arranged from left to right: a left vertical tank, a middle tank, and a right vertical tank. Each tank has at least one feed inlet at the top. The left and right vertical tanks have the same structure and are both double-layered tanks. The right and left vertical tanks are symmetrical in structure with respect to the middle tank.

[0017] The left vertical tank is divided into upper and lower compartments, which are connected by a connecting valve I. The bottom of the upper compartment is conical, and the outlet is close to one corner of the horizontal tank group and the middle tank and is connected to the gate valve and the sand conveying hose. The bottom of the lower compartment is conical, and the outlet is close to one side of the bag breaking device and the elevator and is connected to the gate valve and the sand conveying hose. The sand conveying hose leads into the elevator inlet.

[0018] The conical bottom of the upper silo is connected to the discharge valve I and the discharge hose I. Under the action of gravity, the proppant in the upper silo can fall directly into the hopper of the sand mixing truck through the discharge valve I and the discharge hose I.

[0019] The lower compartment is equipped with a return valve I and a return hose I. The return hose I is connected to the feed inlet of the elevator. The right vertical tank and the left vertical tank have the same symmetrical structure, and their discharge outlets are both located on the side near the middle tank.

[0020] The horizontal tank assembly is composed of stacked tanks, consisting of a bottom tank, a second tank, and a top tank from bottom to top. The horizontal tank assembly is further divided into three compartments: a left compartment, a middle compartment, and a right compartment. The bottom tank has a conical, sloping bottom with a gate valve assembly for proppant discharge. The gate valve assembly includes three gate valves, corresponding to the left, middle, and right compartments respectively. The second tank has an open top and bottom, with a sloping bottom end to facilitate automatic proppant discharge. The top tank has a closed top and an open bottom, with at least one feed inlet on the top of each tank. The bottom tank is sealed to the second tank, and the second tank is sealed to the top tank with rubber gaskets, and both ends are secured with quick-connect bolts.

[0021] The top of the vertical tank assembly is connected to the top of the horizontal tank assembly to form a single plane, and the bottom of all tanks is mounted on a common base.

[0022] The vertical tank unit includes a single-layer intermediate tank. The bottom of the single-layer tank leads to the discharge port through a conical inclined surface. The discharge port is located on the side close to the horizontal tank unit and is connected to a gate valve. The gate valve is connected to a sand conveying hose to introduce the proppant into the sand hopper of the sand mixing truck.

[0023] The bag-breaking device is an integral skid-mounted structure with operating chamber I and operating chamber II located at opposite ends. The bottom of operating chamber I and operating chamber II are connected to electric push rods, and vertical guide rails are installed on the sides to realize electric lifting of the operating chambers. The middle of the bag-breaking device is equipped with bag-breaking hopper I and bag-breaking hopper II. The bottom of bag-breaking hopper I is flexibly connected to transition hopper I, and bag-breaking hopper II is flexibly connected to transition hopper II. Transition hopper I and transition hopper II are respectively connected to the feed inlet of the elevator through flanges.

[0024] The distribution valve assembly is an integral skid-mounted structure, consisting of two sets of distribution valves. Each set of distribution valves has one inlet and four outlet pipes at the top. Each outlet pipe is equipped with a butterfly valve to control the opening and closing of the outlet. The inlets of the two sets of distribution valves are connected to the outlets of the two elevators, respectively. The outlets of the distribution valves near the left vertical tank are connected to the left vertical tank, the intermediate tank, the left side compartment and the intermediate compartment of the horizontal tank group, respectively. The four outlets of the distribution valves near the right vertical tank are connected to the right vertical tank, the intermediate tank, the right side compartment and the intermediate compartment of the horizontal tank group, respectively.

[0025] The horizontal tank assembly is also equipped with cage ladders on both sides and railings on the top edge.

[0026] The beneficial effects of this invention are as follows: The continuous sand conveying device provided by this invention arranges three vertical tanks on one side of the horizontal tank, and a bucket elevator is arranged between each pair of vertical tanks to achieve vertical lifting of the proppant and make full use of the space on both sides of the elevator; the two vertical tanks near the outer side adopt a double-layer tank structure. The proppant in the upper layer is directly introduced into the sand mixing truck by gravity, and the proppant in the lower layer tank is transported to the upper layer tank through the bucket elevator and the distribution valve group, and then fed to the sand mixing truck. This increases the storage capacity of the vertical tank group. The above structural design allows the storage capacity of this invention to be increased by 40% and the conveying capacity to be doubled while the footprint of the present invention is the same as that of existing sand conveying devices, meeting the application requirements of existing unconventional oil and gas fracturing operations with small area, large capacity storage of proppant, and large conveying volume. Attached image description:

[0027] Figure 1 This is a left view of the continuous sand conveying device of the present invention;

[0028] Figure 2 This is a front view of the continuous sand conveying device of the present invention;

[0029] Figure 3 This is a schematic diagram of the horizontal tank assembly structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the vertical tank assembly structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the bag-breaking device of the present invention;

[0032] Figure 6 This is a front view of the distribution valve assembly of the present invention;

[0033] Figure 7 This is a top view of the distribution valve assembly of the present invention;

[0034] Figure 8 This is a schematic diagram of the feed inlet of the vertical tank assembly and the horizontal tank assembly of the present invention;

[0035] Figure 9 This is a schematic diagram showing the connection of the elevator, distribution valve, and bag-breaking device of the present invention.

[0036] In the figure, 1. Horizontal tank group, 2. Vertical tank group, 3. Bag breaking device, 4. Lifting system, 5. Elevator, 6. Distribution valve group, 7. Common base, 8. Electrical control system, 11. Bottom layer tank, 12. Second layer tank, 13. Top layer tank, 14. Cage ladder, 15. Railing, 51. Elevator I, 52. Elevator II, 111. Gate valve group, 161. Bin 1 inlet, 162. Bin 2 inlet I, 163. Bin 2 inlet II, 164. Bin 3 inlet, 21. Left vertical tank, 22. Middle tank, 23. Right vertical tank, 211. Communication valve I, 212. Discharge valve I, 213. Discharge hose I, 214. Return valve I, 215. Return hose I, 221. Discharge valve II, 222. Discharge hose II, 234. Return valve I, 235. Return hose II, 241. Bin 4 feed inlet, 242. Bin 5 feed inlet a, 243. Bin 5 feed inlet b, 244. Bin 6 feed inlet, 311. Operation chamber I, 312. Operation chamber II, 321. Bag breaking hopper I, 322. Bag breaking hopper II, 331. Transition hopper I, 332. Transition hopper II, 51. Elevator I, 53. Elevator II, 511. Elevator I feed inlet, 531. Elevator II feed inlet, 512. Elevator I discharge outlet, 532. Elevator II discharge outlet, 61. Distribution valve skid body, 621. Feed inlet I, 622. Feed inlet II, 631. Discharge outlet a, 632. Discharge outlet b, 633. Discharge outlet c, 634. Discharge outlet d, 635. Discharge outlet e, 636. Discharge outlet f, 637. Discharge outlet g, 638. Discharge outlet h, 641. Butterfly valve a, 642. Butterfly valve b, 643. Butterfly valve c, 644. Butterfly valve d, 645. Butterfly valve e, 646. Butterfly valve f, 647. Butterfly valve g, 648. Butterfly valve h. Detailed Description of the Embodiments

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention shall fall within the protection scope of the present invention.

[0038] The continuous sand conveying device of the present invention, as shown in Figure 1 , Figure 2 , Figure 5 , the continuous sand conveying device is composed of: horizontal tank group 1, vertical tank group 2, bag breaking device 3, lifting system 4, elevator 5, distribution valve group 6, common base 7, electrical control system 8 and the like.

[0039] Horizontal tank group 1 and vertical tank group 2 are arranged on one side of horizontal tank group 1 and connected to horizontal tank group 1, together forming a storage chamber for proppant such as fracturing quartz sand and ceramsite; vertical tank group 2 and horizontal tank group 1 together form 6 chambers to meet the storage of 6 kinds of proppant.

[0040] The bag breaking device 3 is located on one side of the bottom of the vertical tank group 1. The bag breaking device 3 integrates a hoisting operation room and a bag breaking hopper, which are used for hoisting and observing the proppant bag and breaking the bag, respectively.

[0041] The hoisting system 4 is located above the bag breaking device 3, connected to the top of the vertical tank group 2, and connected to the horizontal tank group 1 via a tie rod. It is used to hoist the proppant from the ground to the bag breaking hopper of the bag breaking device 3 for bag breaking and unloading. The hoisting system 4 includes two sets of hoisting electric hoists and a mobile trolley, which can move the proppant ton bags on the guide rail at the same time.

[0042] Elevator 5 is installed between two of the three vertical tanks and connected to the horizontal tank group. The bottom of the elevator is connected to the transition bucket of the bag breaking device, and the top is connected to the distribution valve group for vertical sand conveying of proppant. Elevator 5 is a bucket elevator, and the bucket sprocket tensioning method of the elevator adopts spring tensioning.

[0043] Distribution valve group 6 is located at the top of horizontal tank group 1 and vertical tank group 2 and connected to the discharge port of elevator 5. Distribution valve group 6 is used to control the addition of proppant to one or more compartments of horizontal tank group 1 and vertical tank group 2.

[0044] Electrical control system 7 is installed at the bottom of horizontal tank group 1 and is used for power supply of continuous sand conveying device and control of each actuator;

[0045] The common base 8 consists of interconnected steel structure flat panels, with at least three panels forming a support platform for other equipment.

[0046] Vertical tank group 2 is arranged along the length of horizontal tank group 1, including three independent tanks arranged from left to right: left vertical tank 21, middle tank 22 and right vertical tank 23. Each tank has at least one feed inlet on its top. Left vertical tank 21 and right vertical tank 23 have the same structure and are both double-layered tanks. Right vertical tank 23 and left vertical tank 21 are symmetrical in structure with respect to middle tank 22.

[0047] The left vertical tank 21 is divided into upper and lower compartments, which are connected by a connecting valve I211. The bottom of the upper compartment is conical, and the outlet is close to one corner of the horizontal tank group and the intermediate tank 22 and is connected to the gate valve and the sand conveying hose. The bottom of the lower compartment is conical, and the outlet is close to one side of the bag breaking device 3 and the elevator 5 and is connected to the gate valve and the sand conveying hose. The sand conveying hose leads into the inlet of the elevator 5.

[0048] The top of the vertical tank group 2 is connected to the top of the horizontal tank group 1 to form an integral plane, and the bottom of all tanks is installed on a common base 8.

[0049] The intermediate tank 22 of the vertical tank unit is a single-layer tank. The bottom of the single-layer tank is led out to the discharge port through a conical inclined surface. The discharge port is located on the side close to the horizontal tank unit and is connected to the gate valve. The gate valve is connected to the sand conveying hose to introduce the proppant into the sand hopper of the sand mixing truck.

[0050] The bag-breaking device 3 is an integral skid-mounted structure with operating chambers I 311 and II 312 arranged opposite to each other at both ends. Electric push rods are connected to the bottom of operating chambers I 311 and II 312, and vertical guide rails are set on the sides to realize electric lifting of the operating chambers. Bag-breaking hoppers I 321 and II 322 are set in the middle of the bag-breaking device 3. The bottom of bag-breaking hopper I 321 is flexibly connected to transition hopper I 331, and bag-breaking hopper II 322 is flexibly connected to transition hopper II 332. Transition hoppers I 331 and II 332 are respectively connected to the feed inlet of the elevator through flanges.

[0051] The distribution valve group 6 is an integral skid-mounted structure, including two distribution valves. Each distribution valve group has one inlet and four outlet pipes at the top. Each outlet pipe is equipped with a butterfly valve to control the opening and closing of the outlet. The inlets of the two distribution valve groups are connected to the outlets of the two elevators respectively. The four outlets of the distribution valve near the left vertical tank 21 are connected to the left vertical tank 21, the intermediate tank 22, the left side compartment and the intermediate compartment of the horizontal tank group respectively. The four outlets of the distribution valve near the right vertical tank 23 are connected to the right vertical tank 23, the intermediate tank 22, the right side compartment and the intermediate compartment of the horizontal tank group respectively.

[0052] The horizontal tank group 1 is equipped with cage ladders 14 on both sides and railings 15 on the top edge to ensure the safety of personnel going up the tank for maintenance.

[0053] like Figure 1 , Figure 3 , Figure 8As shown, the horizontal tank assembly 1 is composed of three stacked tanks, from bottom to top including a bottom tank 11, a second tank 12, and a top tank 13. The interior of the horizontal tank assembly 1 is further divided into three compartments along the horizontal direction: a left compartment, a middle compartment, and a right compartment, capable of storing three different specifications of proppant. The left compartment is designated as compartment 1, the middle compartment as compartment 2, and the right compartment as compartment 3. The bottom of the bottom tank 11 has a conical sloped bottom structure, with a gate valve assembly 111 installed at the bottom for proppant discharge. The gate valve assembly 111 includes three gate valves, corresponding to compartments 1, 2, and 3 respectively. The top and bottom of the second tank 12 are open, with a sloped bottom end to facilitate automatic proppant discharge. The top tank 13 has a closed top and an open bottom, with at least one feed inlet pre-installed at the top of each tank. The bottom tank 11 and the second tank 12, and the second tank 12 and the top tank 13 are sealed with rubber gaskets, and both ends are fixed with quick-connect bolts. Figure 4 As shown, the vertical tank group 2 includes three independent tanks arranged from left to right: left vertical tank 21, middle tank 22 and right vertical tank 23. Each tank has at least one feed inlet on its top. The left vertical tank 21 and right vertical tank 23 have the same structure and are both double-layered tanks. The right vertical tank 23 and left vertical tank 21 are symmetrical in structure with respect to the middle tank 22.

[0054] The left vertical tank 21 is divided into upper and lower compartments, which are connected by a connecting valve I211. The bottom of the upper compartment is conical, and the outlet is close to one corner of the horizontal tank group and the intermediate tank 22 and is connected to the gate valve and the sand conveying hose. The bottom of the lower compartment is conical, and the outlet is close to one side of the bag breaking device 3 and the elevator 5 and is connected to the gate valve and the sand conveying hose. The sand conveying hose leads into the inlet of the elevator 5.

[0055] The conical bottom of the upper silo is connected to the discharge valve I212 and the discharge hose I213. Under the action of gravity, the proppant in the upper silo can fall directly into the hopper of the sand mixing truck through the discharge valve I212 and the discharge hose I213.

[0056] The lower compartment is equipped with a return valve I214 and a return hose I215. The return hose I215 is connected to the feed inlet of the elevator 5. The right vertical tank 23 and the left vertical tank 21 have the same symmetrical structure, and their discharge ports are both located on the side near the middle tank 22.

[0057] Among them, left vertical tank 21 is designated as warehouse 4, middle tank 22 as warehouse 5, and right vertical tank 23 as warehouse 6.

[0058] like Figure 4 , Figure 5 , Figure 7As shown, the bag-breaking device 3 has an operating chamber I 311 and an operating chamber II 312 at each end. The bottom of the operating chambers I 311 and II 312 are equipped with lifting devices. During operation, the lifting devices raise the operating chambers I 311 and II 312 to a high position for easy observation by the operator. During transportation, the lifting devices lower the operating chambers I 311 and II 312 for easy transport. The bag-breaking device has a bag-breaking hopper I 321 and a bag-breaking hopper II 322 in the middle. The bag-breaking hoppers I 321 and II 322 are equipped with bag piercers for piercing the proppant ton bags for material discharge. The bottoms of the bag breaking hoppers I 321 and II 322 are connected to the transition hoppers I 331 and II 332 via adjustable chains or slings. The transition hoppers I 331 and II 332 are connected to the return hoses I 215 and II 235 of the elevators I 51 and II 53 via flanges.

[0059] like Figure 6 , Figure 7 , Figure 8 As shown, the distribution valve assembly 6 includes distribution valve assembly I and distribution valve assembly II integrated on the same distribution valve skid 61, which can be installed and transported as a whole. Distribution valve assembly I has two sets of inlets: inlet I 621 and distribution valve assembly II has inlet II 622. Each distribution valve assembly has four sets of outlets, for a total of eight sets of outlets. Each outlet pipe is connected to a butterfly valve. The inlets 621 of distribution valve assembly I and 622 of distribution valve assembly II are connected to the outlets of elevator I 51 and elevator II 53, respectively. The eight outlets are connected to the four inlets of the horizontal tank assembly 1 and the four inlets of the vertical tank assembly, respectively. The corresponding relationships are as follows: outlet b632 is connected to inlet 161 of silo 1 of horizontal tank group 1; outlet 633c is connected to inlet I 162 of silo 2 of horizontal tank group 1; outlet a631 is connected to inlet 241 of silo 4 of left vertical tank 21; outlet d634 is connected to inlet a242 of silo 5 of intermediate tank 22; outlet f636 is connected to inlet II 163 of silo 2 of horizontal tank group 1; outlet g637 is connected to inlet 164 of silo 3 of horizontal tank group 1; outlet e635 is connected to inlet b243 of silo 5 of intermediate tank 22; outlet h638 is connected to inlet 244 of silo 6 of right vertical tank 23.

[0060] By controlling the opening and closing of butterfly valves a641-h648 on the discharge pipe, the proppant conveyed by elevator I 51 can be added to any one or more of bins 1, 2, 4, and 5, and the proppant conveyed by elevator II 52 can be added to any one or more of bins 2, 3, 5, and 6. That is, bins 2 and 5 can simultaneously receive proppant from both elevator I 51 and elevator II 53.

[0061] like Figures 1-9As shown, the working process of the continuous sand conveying device of the present invention is as follows: Two operators operate the two electric hoists of the hoisting system 4 in the control room I 311 and control room II 312 of the bag breaking device 3 to hoist the proppant bag from the transport vehicle into the bag breaking hopper I 321 and bag breaking hopper II 322 to break the bag and discharge the material. The proppant enters the feed inlet 511 of the elevator I and the feed inlet 531 of the elevator II through the transition hopper I 331 and the transition hopper II 332. The proppant is lifted to a high position and enters the distribution valve group 6 from the discharge outlet 512 of the elevator I and the discharge outlet 532 of the elevator II. The control system 8 controls the opening and closing of the butterfly valves a641-h648 to add proppant to the six compartments of the horizontal tank group 1 and the vertical tank group 2.

[0062] The proppant from bins 1, 2, and 3 of the horizontal tank assembly is individually discharged to the sand hopper of the mixing truck via gate valve assembly 111 at the bottom. The proppant from the upper bins of the left vertical tank 21 and right vertical tank 23 of the vertical tank assembly 2, as well as all the proppant from the middle tank 22, is directly fed into the sand hopper of the mixing truck via conveying hoses. The proppant from the lower bins of the left vertical tank 21 and right vertical tank 23 of the vertical tank assembly 2 is lifted twice to their respective upper bins by elevators I 51 and II 53, and then conveyed to the sand hopper of the mixing truck via hoses.

[0063] The specific usage of the continuous sand conveying device of the present invention is as follows:

[0064] After the proppant enters the distribution valve group, it is added to the storage compartments of the horizontal and vertical tank groups by gravity. By controlling the opening and closing of the butterfly valves on the pipelines of each distribution valve group, the proppant can be added to one or more storage compartments. The two distribution valves can simultaneously add proppant to the intermediate tanks of the vertical tank group and the intermediate compartments of the horizontal tank group.

[0065] Two operators in the control room located on the bag breaking device operate two electric hoists of the hoisting system to lift the proppant bags from the transport vehicle into the bag breaking hopper to break the bags and discharge the proppant. The proppant enters the feed port of the elevator from the transition hopper and is lifted to a high position, then enters the distribution valve group from the discharge port of the elevator. The control system issues commands to open different distribution valves to add proppant to one or more compartments of the horizontal and vertical tank groups.

[0066] The proppant from the three compartments of the horizontal tank assembly is independently fed into the sand hopper of the mixing truck via a gate valve assembly at the bottom. The proppant from the upper compartments of the left and right vertical tanks of the vertical tank assembly, as well as all the proppant from the middle tank, is directly fed into the sand hopper of the mixing truck via a conveying hose. The proppant from the lower compartments of the left and right vertical tanks of the vertical tank assembly is lifted a second time to its respective upper compartment by an elevator and then conveyed to the sand hopper of the mixing truck via a hose.

Claims

1. A continuous sand conveying device, characterized in that, include: The horizontal tank group (1) and the vertical tank group (2) are arranged on one side of the horizontal tank group (1) and connected to the horizontal tank group (1) to form a storage chamber for fracturing quartz sand and ceramsite proppant. The vertical tank group (2) and the horizontal tank group (1) together form 6 chambers to meet the storage of 6 kinds of proppant. The bag breaking device (3) is located on one side of the bottom of the vertical tank group (1). The bag breaking device (3) integrates a hoisting operation room and a bag breaking hopper, which are used for hoisting observation and breaking of the support agent bag, respectively. The hoisting system (4) is set above the bag breaking device (3) and connected to the top of the vertical tank group (1). It is used to hoist the proppant from the ground to the bag breaking hopper of the bag breaking device (3) for bag breaking and unloading. The elevator (5) is installed between the three tanks of the vertical tank group (2) and connected to the horizontal tank group. The bottom of the elevator is connected to the transition bucket of the bag breaking device, and the top is connected to the distribution valve group for vertical sand conveying of proppant. The elevator (5) is a bucket elevator, and the bucket sprocket of the elevator is tensioned by spring tension. Distribution valve group (6), the distribution valve group (6) is set at the top of the horizontal tank group (1) and the vertical tank group (2) and connected to the discharge port of the elevator (5), the distribution valve group (6) is used to control the addition of proppant to one or more compartments of the horizontal tank group (1) and the vertical tank group (2); Electrical control system (7), which is installed at the bottom of the horizontal tank group (1) and is used for power supply of equipment and control of each actuator; A common base (8) is a steel structure plate that is spliced ​​together. The steel structure plate is configured with at least 3 pieces to form a support platform for other equipment. The vertical tank assembly (2) includes three independent tanks arranged from left to right: a left vertical tank (21), a middle tank (22), and a right vertical tank (23). Each tank has at least one feed inlet on its top. The left vertical tank (21) and the right vertical tank (23) have the same structure and are both double-layered tanks. The right vertical tank (23) and the left vertical tank (21) are symmetrical in structure with respect to the middle tank (22). The left vertical tank (21) is divided into upper and lower compartments, which are connected by a connecting valve I (211). The bottom of the upper compartment is conical, and the outlet is close to one corner of the horizontal tank group and the middle tank (22) and connected to the gate valve and the sand conveying hose. The bottom of the lower compartment is conical, and the outlet is close to one side of the bag breaking device (3) and the elevator (5) and connected to the gate valve and the sand conveying hose. The sand conveying hose is introduced into the inlet of the elevator (5). The horizontal tank assembly (1) is composed of three stacked tanks, including a bottom tank (11), a second tank (12), and a top tank (13) from bottom to top. The bottom tank (11) has a conical slope structure at the bottom, and a gate valve assembly (111) is installed at the bottom of the cone for unloading the proppant. The gate valve assembly (111) includes three gate valves, corresponding to the bottom tank (11), the second tank (12), and the top tank (13) respectively. The top and bottom of the second tank (12) are open, and the bottom end is sloped to meet the automatic feeding of the proppant. The top tank (13) has a closed structure at the top and an open bottom, with at least one feed port reserved at the top of each tank. The bottom tank (11) and the second tank (12), and the second tank (12) and the top tank (13) are sealed with rubber gaskets, and the two ends are fixed with quick-connect bolts. The horizontal tank assembly (1) is divided into three compartments along the horizontal direction, namely the left compartment, the middle compartment, and the right compartment. The top of the vertical tank group (2) is connected to the top of the horizontal tank group (1) to form an integral plane, and the bottom of all tanks is installed on a common base (8); The bag breaking device (3) is an integral skid-mounted structure with operating chamber I (311) and operating chamber II (312) arranged opposite to each other at both ends. The bottom of operating chamber I (311) and operating chamber II (312) are connected to electric push rods, and the side is provided with vertical guide rails to realize electric lifting of the operating chambers. The middle of the bag breaking device (3) is provided with bag breaking hopper I (321) and bag breaking hopper II (322). The bottom of bag breaking hopper I (321) is softly connected to transition hopper I (331), and bag breaking hopper II (322) is softly connected to transition hopper II (332). The transition hopper I (331) and transition hopper II (332) are respectively connected to the feed port of the elevator through flanges.

2. The continuous sand conveying device according to claim 1, characterized in that, The conical bottom of the upper hopper is connected to the discharge valve I (212) and the discharge hose I (213). Under the action of gravity, the proppant in the upper hopper can fall directly into the hopper of the sand mixing truck through the discharge valve I (212) and the discharge hose I (213). The lower compartment is equipped with a return valve I (214) and a return hose I (215). The return hose I (215) is connected to the feed inlet of the elevator (5). The right vertical tank (23) and the left vertical tank (21) have the same symmetrical structure, and their discharge outlets are both on the side close to the middle tank (22).

3. The continuous sand conveying device according to claim 1, characterized in that, The intermediate tank (22) is a single-layer tank. The bottom of the single-layer tank is led out to the discharge port through a conical inclined surface. The discharge port is located on the side close to the horizontal tank group and is connected to the gate valve. The gate valve is connected to the sand conveying hose to introduce the proppant into the sand hopper of the sand mixing truck.

4. The continuous sand conveying device according to claim 1, characterized in that, The distribution valve group (6) is an integral skid-mounted structure, including two distribution valves. Each distribution valve has one inlet and four outlet pipes at the top. Each outlet pipe is equipped with a butterfly valve to control the opening and closing of the outlet. The inlets of the two distribution valves are connected to the outlets of the two elevators respectively. The four outlets of the distribution valve near the left vertical tank (21) are connected to the left vertical tank (21), the middle tank (22), the left side compartment and the middle compartment of the horizontal tank group respectively. The four outlets of the distribution valve near the right vertical tank (23) are connected to the right vertical tank (23), the middle tank (22), the right side compartment and the middle compartment of the horizontal tank group respectively.

5. The continuous sand conveying device according to claim 1, characterized in that, The horizontal tank group (1) is also equipped with cage ladders (14) on both sides and railings (15) on the top edge.

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