CN219691516U - Small-displacement sand mixing pry for ground stress capacity expansion - Google Patents

Abstract

The utility model discloses a small-displacement sand mixing sled for ground stress capacity expansion, belongs to the technical field of oil and gas enhanced petroleum extraction machinery, and solves the problem that small vehicles on a plurality of construction sites cannot put the existing sand mixing device; the device comprises a prying block, a sand hopper, a stirring tank and a screw conveyor, wherein the sand hopper, the stirring tank and the screw conveyor are arranged on the prying block at intervals along the length direction of the prying block, a sand inlet of the screw conveyor is arranged above the sand hopper, a sand outlet of the screw conveyor is arranged above the stirring tank, one side of the stirring tank, which is far away from the sand hopper, is provided with a suction pump and a mortar pump, the stirring tank is communicated with a suction pipe and a mortar discharging pipe, the suction pipe is connected with the suction pump, and the mortar discharging pipe is connected with the mortar pump; one side of the suction pump is also provided with a control cabinet, and the control cabinet is electrically connected with the suction pump, the mortar pump, the screw conveyor and the stirring motor of the stirring tank. The utility model has simple and compact structure, small volume and small occupied area, and the whole sand mixing speed, the sand mixing proportion and the external output flow are automatically controlled by the control cabinet through controlling each motor and each pump.

Description

Small-displacement sand mixing pry for ground stress capacity expansion

Technical Field

The utility model belongs to the technical field of oil and gas yield-increasing petroleum machinery, and particularly relates to a small-displacement sand mixing sled for ground stress capacity expansion.

Background

At present, the high-pressure filling sand control technology is widely applied in oilfield development, namely, quartz sand and sand-carrying fluid are mixed, and the high-pressure filling sand control technology is injected into stratum and shaft through a high-pressure pump to achieve the purpose of preventing sand from being produced from the stratum. The technology is characterized by large quartz sand consumption (about 30 tons) and large construction discharge capacity (1.5 m) ³ About/min), the sand-carrying fluid consumption is more (200 m) ³ Left and right), the construction pressure is high (about 20 MPa), and the continuous working time is long.

At present, four to five special sand control groups, one sand mixing vehicle, one to two sand hopper vehicles and eight to ten tank trucks are needed for completing the work. It has the following disadvantages:

1. many smaller vehicles at the construction site cannot place so many devices;

2. the existing sand mixing device has overlarge discharge capacity and design sand conveying capacity, and the problem that small-discharge low-concentration sand mixing liquid meeting design requirements cannot be accurately configured.

Disclosure of Invention

In view of the above, the utility model provides a small-displacement sand mixing sled for ground stress capacity expansion, which solves the problems that a plurality of small vehicles cannot be placed in the prior construction sites, and small-displacement and low-concentration sand mixing liquid meeting the design requirement cannot be accurately configured.

The technical scheme adopted by the utility model is as follows:

the small-displacement sand mixing pry for the ground stress capacity expansion is characterized by comprising a pry block, a sand hopper, a stirring tank and a screw conveyor, wherein the sand hopper, the stirring tank and the screw conveyor are arranged on the pry block at intervals along the length direction of the pry block, a sand inlet of the screw conveyor and the sand hopper, a sand outlet of the screw conveyor is positioned above the stirring tank, a suction pump and a mortar pump are arranged on one side, far away from the sand hopper, of the stirring tank, a suction pipe and a mortar discharging pipe are communicated with the stirring tank, the suction pipe is connected with the suction pump, and the mortar discharging pipe is connected with the mortar pump; one side of the suction pump is also provided with a control cabinet, and the control cabinet is electrically connected with the suction pump, the mortar pump, the screw conveyor and the stirring motor of the stirring tank.

In the technical proposal, the stirring tank adopts a steel structure, the upper part is round, the bottom is cone-shaped, and the internal volume is more than 1.5m ³ The upper water port is connected with the outlet end of the suction pump, the suction port is not higher than 30% of the tank height, the bottom is provided with a liquid outlet with a butterfly valve of 4 inches, and the outlet connected with the mortar pump is arranged at the bottom of the tank body as much as possible; the stirrer in the stirring device is arranged in the stirring tank, the stirring motor is arranged in the middle of the upper part and fixed, the water is downwards pressed (three layers of stirring blades) when the blades rotate, the stirring motor cannot rub the wall of the tank, and the motor is additionally provided with a speed reducer to ensure that the rotating speed is about 88 r/min; the spiral conveyor adopts a single auger inclined sand conveying mode, and is driven by a variable frequency motor, wherein the maximum sand conveying amount is 300KG/min; sand hopper volume 0.8m ³ And installing a filter screen; the bottom is provided with a manual gate valve, and the bottom is reinforced to bear the weight of the ton bag; control system of control cabinetThe panel operation mode of the explosion-proof control box is convenient to install and operate safely, and meanwhile, the operation condition of each pump motor can be observed conveniently; the principle of the scheme is as follows: firstly, an inlet of a suction pipe is communicated with a liquid tank filled with liquid, then quartz sand is input into a sand hopper, the quartz sand enters a screw conveyor, the screw conveyor lifts the quartz sand above a stirring tank and guides the quartz sand into the stirring tank, the stirring tank starts stirring (the proportion of the quartz sand to water is realized by a control cabinet through adjusting and controlling the rotation speed and output power of a motor of the screw conveyor and a suction pump), the mixed mortar is connected with a high-pressure pump set (a fracturing set) after passing through a slurry discharge pipe under the action of a mortar pump, and meanwhile, the mortar is sent to a plurality of fracturing vehicles, the fracturing vehicles fill the sand-proof layer section of an oil-gas well with the quartz mortar, and a wall is arranged on a sand-proof layer section ring Zhou Zhucheng to block sand coming out of the oil layer, so that normal production of the oil-gas well is ensured. In conclusion, the utility model has the advantages of simple and compact structure, small volume and small occupied area, and the whole sand mixing speed, the sand mixing proportion and the external transmission flow are automatically controlled by the control cabinet through controlling each motor and each pump; secondly, each pipeline and the pump body of this device are all established in agitator tank one side for it forms sharp interval arrangement form with agitator tank and sand hopper, and the mutual interference is little, the influence is little, the staff of being convenient for overhauls each device.

Preferably, the inlet of the suction pipe and the outlet of the pulp discharging pipe face to one side in the width direction of the prying block.

Among this technical scheme, it is to be noted that, in the site operation, liquid jar and the fracturing string group that are equipped with the water source all can arrange in sled piece width direction's one side, promptly towards the long limit of sled piece, consequently, this scheme is with the entry of inhaling the pipe and the export of row thick liquid pipe all towards sled piece width direction's one side, is convenient for inhale the pipe and be connected with liquid jar, is convenient for row thick liquid pipe and fracturing string group to be connected.

Preferably, the suction pipe is provided with an electromagnetic flowmeter electrically connected with the control cabinet.

In the technical scheme, the electromagnetic flowmeter is an instrument for measuring the flow of the conductive fluid according to the electromotive force induced when the conductive fluid passes through an external magnetic field by applying an electromagnetic induction principle, and is mainly used for monitoring the flow of water in a suction pipe.

Preferably, the inlet of the suction pipe and the outlet of the slurry discharging pipe are both provided with butterfly valves.

In the technical scheme, the inlet of the suction pipe is a 3-group 4-inch 206 union joint with a butterfly valve, so that the suction pipe is convenient to connect with a liquid tank and is ensured to be not lower than 3m ³ The water feeding discharge capacity per min, and a filter screen is added at the suction inlet; the pipeline connection adopts a flange connection mode; 3 groups of 4 inch union interfaces are arranged at the outlet of the slurry discharging pipe, so that the slurry discharging pipe is convenient to connect with a fracturing pump.

Preferably, the top of sled piece is equipped with the crossbeam, the crossbeam is two, two the crossbeam sets up along the width direction interval of sled piece, every the bottom of crossbeam is all connected through a plurality of pole settings and sled piece bottom respectively, and two connect through the reinforcing beam between the crossbeam, the reinforcing beam is a plurality of, a plurality of the reinforcing beam sets up along the length direction interval of sled piece.

According to the technical scheme, the arranged cross beam, the reinforcing beam and the upright rods are convenient for the device to be used outdoors, and the top of the device can be provided with a rain shed for preventing rain and snow; and the whole hoisting and the transportation are convenient.

Preferably, the cross beam, the reinforcing beam and the vertical rod are hollow structures.

In this technical scheme, crossbeam, reinforcing beam and pole setting have all been hollow structure not only alleviateed the weight of whole device, are convenient for transport, but also save material.

Preferably, the cross beam comprises openings at two ends of the cross beam, a sealing device for sealing the openings is arranged on the cross beam, the sealing device comprises a stop block and an inserting block, one end of the inserting block is connected with the stop block, the other end of the inserting block is inserted into an inner cavity of the cross beam through the openings, and the inserting block is in clearance fit with the inner cavity of the cross beam.

In this technical scheme, it is to be noted that, because the crossbeam is hollow structure, when meetting raining or snowing the condition, rain and snow can go out from the both ends opening of crossbeam and enter into the crossbeam in, causes its inside ponding, and secondly, the crossbeam both ends still collide with the vehicle easily, cause the vehicle wearing and tearing, to these two problems, this scheme is equipped with inserted block and dog, and the inserted block lateral wall covers sealing rubber layer, still plays sealed effect when fixed inserted block, and the dog is the disc shape, and the tip is equipped with the rubber protection pad.

Preferably, the sand hopper is internally provided with a filtering device, the filtering device comprises a filter screen and a vibrating assembly, the filter screen is slidably embedded in the sand hopper, the vibrating assembly comprises a motor and a cam, the motor is arranged on the side wall of the sand hopper, an output shaft of the motor penetrates into the inner wall of the sand hopper to be connected with the cam, and the cam is in contact with the bottom of the filter screen.

In this technical scheme, be used for filtering the unqualified quartz sand of size through setting up the filter screen, be used for driving the cam through the motor that sets up and rotate, the cam rotates and constantly strikes the filter screen for it shakes to cross the filter screen, prevents that quartz sand from blockking up the filter screen, influences filtration efficiency.

Preferably, a plurality of mounting plates are arranged on the inner wall of the sand hopper, a spring is arranged at the top of each mounting plate, one end of each spring, which is far away from the mounting plate, is connected with a filter screen, the filter screen is detachably connected with the spring, a sliding block in threaded connection with the filter screen is arranged at the bottom of the filter screen, the sliding block is in sliding connection with the sand hopper, and the sliding block is fixedly connected with the top of the spring.

In the technical scheme, the spring is used for assisting the filter screen to reset; and it also needs to be stated that, sometimes, quartz sand is purchased uniformly at factories, the size is relatively uniform, the filter screen is not needed to filter, and when the situation is met, the filter screen can be removed from the sliding block, so that the influence of the filter screen on the feeding rate is avoided.

In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:

1. the utility model has simple and compact structure, small volume and small occupied area, the whole sand mixing speed, the sand mixing proportion and the external transmission flow are automatically controlled by the control cabinet through controlling each motor and each pump, and the precision is high;

2. all pipelines and the pump body of the device are arranged on one side of the stirring tank, so that the device forms a linear interval arrangement form with the stirring tank and the sand hopper, interference among the pipelines and the pump body is small, influence is small, and the device is convenient for a worker to overhaul all devices.

Drawings

The utility model will now be described by way of example and with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of the main structure of the present utility model;

FIG. 2 is a schematic elevational view of the present utility model;

FIG. 3 is a schematic top view of the present utility model;

FIG. 4 is a left side schematic view of the present utility model;

FIG. 5 is a schematic view of a split perspective of a beam and stop of the present utility model;

FIG. 6 is a schematic perspective view of a sand hopper of the present utility model;

FIG. 7 is a schematic view of a split perspective of the sand hopper and filter screen of the present utility model;

FIG. 8 is a cross-sectional view of a sand hopper of the present utility model;

reference numerals

10-prizing blocks, 20-sand hoppers, 21-filter screens, 22-motors, 23-cams, 24-mounting plates, 25-springs, 26-sliding blocks, 30-screw conveyors, 40-stirring tanks, 50-control cabinets, 60-slurry discharging pipes, 61-outlets, 62-slurry pumps, 70-suction pipes, 71-inlets, 72-suction pumps, 80-crossbeams, 81-upright rods, 82-reinforcing beams, 83-baffle blocks and 84-plug blocks.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

In addition, the embodiments of the present utility model and the features of the embodiments may be combined with each other without collision.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present utility model and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In addition, the embodiments of the present utility model and the features of the embodiments may be combined with each other without collision.

Example 1

As shown in fig. 1, the embodiment of the utility model discloses a small-displacement sand mixing sled for ground stress capacity expansion, which is characterized by comprising a sled block 10, a sand hopper 20, a stirring tank 40 and a screw conveyor 30, wherein the sand hopper 20 and the stirring tank 40 are arranged on the sled block 10, the sand hopper 20 and the stirring tank 40 are arranged at intervals along the length direction of the sled block 10, and a sand inlet of the screw conveyor 30 is connected with the sand inlet of the screw conveyorThe sand hopper 20, the sand outlet of the screw conveyor 30 is positioned above the stirring tank 40, a suction pump 72 and a mortar pump 62 are arranged on one side of the stirring tank 40 far away from the sand hopper 20, a suction pipe 70 and a mortar discharging pipe 60 are communicated with the stirring tank 40, the suction pipe 70 is connected with the suction pump 72, and the mortar discharging pipe 60 is connected with the mortar pump 62; a control cabinet 50 is further provided on one side of the suction pump 72, and the control cabinet 50 is electrically connected to the suction pump 72, the mortar pump 62, the screw conveyor 30, and the stirring motor of the stirring tank 40. The stirring tank 40 is made of steel, has a circular upper part and a conical bottom part, and has an internal volume of more than 1.5m ³ The upper water port is connected with the outlet 61 of the suction pump 72, the suction inlet 71 is not higher than 30% of the tank height, the bottom is provided with a liquid outlet with a butterfly valve of 4 inches, and the outlet 61 of the mortar pump 62 is connected at the bottom of the tank as much as possible; the stirrer in the stirring device is arranged in the stirring tank 40, the stirring motor 22 is arranged in the middle of the upper part and fixed, and when the blades rotate, water is downwards pressed (three layers of stirring blades) and cannot rub the tank wall, and the motor 22 is additionally provided with a speed reducer to ensure that the rotating speed is about 88 r/min; the screw conveyor 30 adopts a single auger inclined sand conveying mode, and the variable frequency motor 22 is driven to convey the maximum sand amount of 300kg/min; sand hopper 20 volume 0.8m ³ The bottom is provided with a manual gate valve, and the bottom is reinforced and can bear the weight of the ton bag; the control system of the control cabinet 50 is in an explosion-proof control box panel operation mode, so that the installation is convenient for safe operation and the running condition of each pump motor 22 can be conveniently observed.

As shown in fig. 1 and 2, in the present embodiment, the inlet 71 of the suction pipe 70 and the outlet 61 of the pulp discharging pipe 60 face one side in the width direction of the skid 10. It should be noted that, in site construction, the liquid tank with water source and the fracturing truck set are arranged on one side of the width direction of the skid 10, i.e. facing the long side of the skid 10, so that the inlet 71 of the suction pipe 70 and the outlet 61 of the slurry discharging pipe 60 are both facing one side of the width direction of the skid 10, which is convenient for the connection of the suction pipe 70 and the liquid tank, and for the connection of the slurry discharging pipe 60 and the fracturing truck set.

In this embodiment, the suction pipe 70 is provided with an electromagnetic flowmeter electrically connected to the control cabinet 50. An electromagnetic flowmeter is an instrument for measuring the flow rate of a conductive fluid according to the electromotive force induced when the conductive fluid passes through an externally applied magnetic field by applying the principle of electromagnetic induction, and is mainly used for monitoring the flow rate of water in a suction pipe 70 in the scheme.

As shown in fig. 1, in the present embodiment, the inlet 71 of the suction pipe 70 and the outlet 61 of the pulp discharging pipe 60 are provided with butterfly valves. It should be noted that, the inlet 71 of the suction pipe 70 is a 3-group 4-inch 206 union interface with butterfly valve, which is convenient for connecting the liquid tank and ensures not lower than 3m ³ The water supply displacement per min, and the suction inlet 71 is added with a filter screen; the pipeline connection adopts a flange connection mode; 3 groups of 4 inch union interfaces are arranged at the outlet 61 of the slurry discharging pipe 60, so that the fracturing pump can be conveniently connected.

The working principle of the embodiment is as follows: firstly, an inlet 71 of a suction pipe 70 is communicated with a liquid tank filled with liquid, then quartz sand is input into a sand hopper 20, the quartz sand enters a screw conveyor 30, the screw conveyor 30 lifts the quartz sand above a stirring tank 40 and guides the quartz sand into the stirring tank 40, the stirring is started by the stirrer (the proportion of the quartz sand to water is realized by a control cabinet 50 through adjusting and controlling the rotating speed and output power of a motor 22 and a suction pump 72 of the screw conveyor 30), the mixed mortar is connected with a high-pressure pump set (a fracturing set) after passing through a slurry discharge pipe 60 under the action of a mortar pump 62, meanwhile, the mortar is sent to a plurality of fracturing vehicles, the fracturing vehicles are filled with the quartz mortar to an oil well sand prevention layer section, sand from an oil layer is blocked by a sand prevention layer section ring Zhou Zhucheng wall, and normal production of the oil and gas well is ensured. In summary, the utility model has simple and compact structure, small volume and small occupied area, and the whole sand mixing speed, sand mixing proportion and external output flow are automatically controlled by the control cabinet 50 through controlling each motor 22 and pump; secondly, each pipeline and the pump body of this device are all established in agitator tank 40 one side for it forms sharp interval arrangement form with agitator tank 40 and sand hopper 20, and the mutual interference is little, the influence is little, the staff of being convenient for overhauls each device.

Example 2

As shown in fig. 1-4, this embodiment is substantially the same as the above embodiment, and is different in that two beams 80 are disposed above the skid 10, two beams 80 are disposed at intervals along the width direction of the skid 10, the bottom of each beam 80 is connected to the bottom of the skid 10 through a plurality of vertical rods 81, and two beams 80 are connected through a reinforcing beam 82, and the reinforcing beams 82 are plural and the reinforcing beams 82 are disposed at intervals along the length direction of the skid 10. The beam 80, the reinforcing beam 82 and the upright rod 81 are arranged to facilitate the rain shed to prevent rain and snow when the device is used in the field; and the whole hoisting and the transportation are convenient.

As shown in fig. 1 and 5, in this embodiment, the cross beam 80, the reinforcing beam 82, and the upright 81 are hollow. The cross beam 80, the reinforcing beam 82 and the upright 81 are hollow structures, so that the weight of the whole device is reduced, the transportation is convenient, and materials are saved.

In this embodiment, as shown in fig. 5, the cross beam 80 includes openings at two ends thereof, the cross beam 80 is provided with a closing device for closing the openings, the closing device includes a stop 83 and an insert block 84, one end of the insert block 84 is connected with the stop 83, the other end of the insert block 84 is inserted into the cavity of the cross beam 80 through the openings, and the insert block 84 and the cavity of the cross beam 80 are in clearance fit. It should be noted that, because the crossbeam 80 is hollow structure, when meeting raining or snowing circumstances, rainwater or snow can go out from the both ends opening of crossbeam 80 and enter into crossbeam 80, causes its inside ponding, secondly, crossbeam 80 both ends still bump with the vehicle easily, cause the vehicle wearing and tearing, to these two problems, this scheme is equipped with cartridge 84 and dog 83, cartridge 84 lateral wall covers the sealing rubber layer, in fixed cartridge 84, still plays sealed effect, and dog 83 is the disc shape, and the tip is equipped with the rubber protection pad.

Example 3

As shown in fig. 6 and 7, this embodiment is substantially the same as the above embodiment, except that a filtering device is disposed in the sand hopper 20, the filtering device includes a filter screen 21 and a vibration assembly, the filter screen 21 is slidably embedded in the sand hopper 20, the vibration assembly includes a motor 22 and a cam 23, the motor 22 is disposed on a side wall of the sand hopper 20, an output shaft of the motor 22 penetrates into an inner wall of the sand hopper 20 to be connected with the cam 23, and the cam 23 contacts with a bottom of the filter screen 21. Through setting up the filter screen and be used for filtering the unqualified quartz sand of size, be used for driving cam 23 rotation through the motor 22 that sets up, cam 23 rotates and constantly strikes filter screen 21 for filter screen 21 produces vibrations, prevents quartz sand jam filter screen 21, influences filtration efficiency.

As shown in fig. 8, in this embodiment, a plurality of mounting plates 24 are disposed on the inner wall of the sand hopper 20, a spring 25 is disposed on the top of each mounting plate 24, one end of the spring 25 away from the mounting plate 24 is connected with a filter screen 21, the filter screen 21 is detachably connected with the spring 25, a slider 26 in threaded connection with the filter screen 21 is disposed on the bottom of the filter screen 21, the slider 26 is slidably connected with the sand hopper 20, and the slider 26 is fixedly connected with the top of the spring 25. The spring 25 is used for assisting the filter screen 21 to reset; and it should be noted that, sometimes, quartz sand is purchased uniformly at factories, the size is relatively uniform, the filter screen 21 is not required to be filtered, and when the condition is met, the filter screen 21 can be removed from the sliding block 26, so that the influence of the filter screen 21 on the feeding rate is avoided.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The utility model provides a small-displacement sand mixing sled for earth stress capacity expansion, its characterized in that includes sled piece (10) and establishes sand hopper (20), agitator tank (40) and screw conveyer (30) on sled piece (10), sand hopper (20) and agitator tank (40) are along the length direction interval setting of sled piece (10), the sand inlet and the sand hopper (20) intercommunication of screw conveyer (30), the sand outlet of screw conveyer (30) is located agitator tank (40) top, one side that sand hopper (20) were kept away from to agitator tank (40) is equipped with suction pump (72) and mortar pump (62), the last intercommunication of agitator tank (40) has suction pipe (70) and pulp discharging pipe (60), suction pipe (70) are connected with suction pump (72), pulp discharging pipe (60) are connected with mortar pump (62); a control cabinet (50) is further arranged on one side of the suction pump (72), and the control cabinet (50) is electrically connected with the suction pump (72), the mortar pump (62), the screw conveyor (30) and the stirring motor of the stirring tank (40); the top of sled piece (10) is equipped with crossbeam (80), crossbeam (80) are two, two crossbeam (80) are along the width direction interval setting of sled piece (10), every the bottom of crossbeam (80) is all connected through a plurality of pole settings (81) and sled piece (10) bottom respectively, and two connect through strengthening beam (82) between crossbeam (80), strengthening beam (82) are a plurality of, a plurality of strengthening beam (82) are along the length direction interval setting of sled piece (10).

2. The small-displacement sand mixing sled for ground stress capacity expansion according to claim 1 is characterized in that the inlet (71) of the suction pipe (70) and the outlet (61) of the slurry discharging pipe (60) are both directed to one side in the width direction of the sled block (10).

3. The small-displacement sand mixing sled for ground stress capacity expansion according to claim 1 wherein the suction pipe (70) is provided with an electromagnetic flowmeter electrically connected with a control cabinet (50).

4. The small-displacement sand mixing sled for ground stress capacity expansion according to claim 1 wherein the inlet (71) of the suction pipe (70) and the outlet (61) of the slurry discharge pipe (60) are both provided with butterfly valves.

5. The small-displacement sand mixing sled for ground stress capacity expansion according to claim 1 wherein the cross beam (80), the reinforcing beam (82) and the upright (81) are all hollow structures.

6. The small-displacement sand mixing sled for ground stress capacity expansion according to claim 5, wherein the cross beam (80) comprises openings at two ends of the cross beam, a sealing device for sealing the openings is arranged on the cross beam (80), the sealing device comprises a stop block (83) and an inserting block (84), one end of the inserting block (84) is connected with the stop block (83), the other end of the inserting block (84) is inserted into an inner cavity of the cross beam (80) through the openings, and the inserting block (84) and the inner cavity of the cross beam (80) are in clearance fit.

7. The small-displacement sand mixing sled for ground stress capacity expansion according to any one of claims 1-6 wherein a filtering device is arranged in the sand hopper (20), the filtering device comprises a filter screen (21) and a vibration assembly, the filter screen (21) is slidably embedded in the sand hopper (20), the vibration assembly comprises a motor (22) and a cam (23), the motor (22) is arranged on the side wall of the sand hopper (20), an output shaft of the motor (22) penetrates into the inner wall of the sand hopper (20) to be connected with the cam (23), and the cam (23) is in contact with the bottom of the filter screen (21).

8. The small-displacement sand mixing sled for ground stress capacity expansion according to claim 7 wherein a plurality of mounting plates (24) are arranged on the inner wall of the sand hopper (20), a spring (25) is arranged at the top of each mounting plate (24), and one end of the spring (25) far away from the mounting plate (24) is connected with the filter screen (21).

9. The small-displacement sand mixing sled for ground stress capacity expansion according to claim 8 wherein the filter screen (21) is detachably connected with the spring (25), a sliding block (26) in threaded connection with the filter screen (21) is arranged at the bottom of the filter screen, the sliding block (26) is in sliding connection with the sand hopper (20), and the sliding block (26) is fixedly connected with the top of the spring (25).