CN117040176A - Shifting device and method for sand mixing sledge motor - Google Patents

Abstract

The invention discloses a shifting device and a shifting method for a sand mixing sledge motor, belonging to the technical field of petroleum drilling equipment; the device comprises a motor assembly arranged on an electrically-driven fracturing sand mixing sledge base, wherein the motor assembly comprises a motor and a mounting seat and is assembled on the sand mixing sledge base through the mounting seat; according to the invention, the motor module can be independently moved out under the working requirement by combining the lifting and translation arrangement, compared with the traditional structural design, the reservation of maintenance operation space required to be considered by the original structure is not considered in maintenance, more operation steps are provided in the whole structural action compared with the traditional structure, but in specific operation, the design has the advantage of convenience, is more rapid in maintenance, further improves the maintenance efficiency, and simultaneously can enable the whole sand mixing sledge structure to be more compact without more space required to be considered for subsequent maintenance.

Description

Shifting device and method for sand mixing sledge motor

Technical Field

The invention relates to a shifting device and a shifting method for a sand mixing sledge motor, and belongs to the technical field of petroleum drilling and production equipment.

Background

The electrically-driven fracturing sand mixing sledge adopts a variable frequency motor and a closed design, so that the liquid and the fracturing sand are rapidly and accurately controlled, the impurities and the rainwater are well protected, and the fracturing process requirements under the complex working conditions can be met; the device can realize 24-hour continuous operation, has high safety, greatly reduces labor intensity, realizes automatic control and integrated operation of sand mixing equipment and sand storage device equipment, can greatly improve the efficiency and quality of fracturing sand mixing operation, reduces operation cost, and is advanced equipment of the existing sand mixing system.

The motor is used as a power source of the electric drive fracturing sand mixing sledge, and the work efficiency and quality of the electric drive fracturing sand mixing sledge are determined by the maintenance difficulty of the motor. The motor maintenance of the existing electrically-driven fracturing sand mixing sledge has the following technical defects:

in the existing electrically-driven fracturing sand mixing sledge, when a motor needs maintenance or has a fault and needs to be overhauled, the operation space is limited, the movable bed plate or the rack above the motor assembly can only be detached, then the inlet flange and the outlet flange of the pump are detached, and the motor assembly is integrally hoisted to the ground by a crane for related operation. After maintenance or overhaul work is completed, the hoisting is carried out again to realize the re-assembly. The whole process takes long time, is troublesome to operate, needs to use a crane, and has high cost, low working efficiency and influences the construction progress of fracturing operation.

Disclosure of Invention

The invention aims at: aiming at the problems, the device and the method for shifting the sand mixing sledge motor are provided, the device and the method are simple in design structure, convenient in operation mode, more importantly, the device and the method can be directly completed through manual operation without any other power supply and the like, and the maintenance efficiency of the motor is effectively improved.

The technical scheme adopted by the invention is as follows:

a displacement device for sand mixing sledge motor, its characterized in that: the electric fracturing sand mixing skid comprises a motor assembly arranged on an electric fracturing sand mixing skid base, wherein the motor assembly comprises a motor and a mounting seat and is assembled on the sand mixing skid base through the mounting seat;

the bottom of the mounting seat is provided with a lifting mechanism for lifting the motor assembly, and the top of the lifting mechanism is detachably assembled with the mounting seat;

and a side pulling mechanism for shifting the mounting seat is further arranged on one side of the mounting seat.

Further, the motor assembly further comprises a pump, and the motor is assembled with the pump through a coupling.

Further, the lifting mechanism and/or the side pulling mechanism are/is an electric telescopic cylinder, a screw rod or a hydraulic telescopic cylinder.

Further, the lifting mechanism comprises a first nut fixedly arranged on the sand mixing sledge base and a screw rod matched with the first nut, the screw rod is assembled in the first nut and can realize up-and-down displacement through thread matching, and the top of the screw rod is matched with the bottom surface of the mounting seat.

Further, the screw rod is a double-end screw rod, the lifting mechanism further comprises a nut mechanism arranged at the bottom of the mounting seat, the nut mechanism is matched with the upper part of the double-end screw rod, and the height of the motor assembly is adjusted through rotation of the double-end screw rod.

Further, the nut mechanism comprises a second nut which is matched with the upper part of the screw rod and is opposite to the first nut in rotation direction, and a third nut which is fixedly arranged at the bottom of the mounting seat, wherein the third nut is matched with the second nut through internal and external threads, and the rotation direction of the third nut is the same as the rotation direction matched between the second nut and the screw rod.

Further, the second nut, the third nut and the screw rod are provided with matched strip-shaped holes, bolts are arranged in the strip-shaped holes, and the screw rod and the second nut or the second nut and the third nut are relatively and fixedly assembled by adjusting the positions of the bolts.

Further, the side pulling mechanism comprises a supporting seat arranged on one side of the sand mixing sledge base, a telescopic push-pull rod capable of pulling out or pushing in the motor assembly is arranged on the supporting seat, and one end of the push-pull rod is assembled with the motor assembly.

Further, the upper portion of supporting seat is provided with the through-hole, the push-and-pull rod is the lead screw and can run through the through-hole be provided with two nuts on the push-and-pull rod to be located the both ends portion of through-hole respectively in order to laminate with the supporting seat face.

Further, after the motor assembly is lifted, a shifting mechanism which is convenient for shifting the motor assembly can be assembled at the bottom of the mounting seat.

Further, the shifting mechanism comprises a roller wheel arranged between the bottom of the mounting seat and the sand mixing sledge base; or the displacement mechanism comprises a roller track mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a pulley sliding rail mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a gear rack mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a chain wheel and chain mechanism arranged between the bottom of the mounting seat and the base of the sand mixing sledge.

The displacement method for the sand mixing sledge motor adopts the displacement device for the sand mixing sledge motor, and comprises the following steps of:

s1, in an initial state, a motor assembly is placed on a sand mixing sledge base through a mounting seat and is fixed through bolts;

s2, when the motor assembly needs to be maintained, removing a connecting bolt between the mounting seat and the sand mixing sledge, and removing flange connection at an inlet and an outlet of the pump;

s3, operating the lifting mechanism, lifting the motor assembly to a target position through the lifting mechanism, at the moment, enabling the mounting seat to leave the base of the sand mixing sledge, generating a gap between the mounting seat and the sand mixing sledge, installing a shifting mechanism in the gap after generating the gap, and adjusting the lifting mechanism to enable the bottom of the mounting seat to be separated from the lifting mechanism;

s4, operating the side pulling mechanism to pull out the motor assembly and maintaining the motor assembly;

and S5, after maintenance is completed, the motor assembly is returned to the original position according to the reverse action process of the step S4-S1.

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

1. according to the shifting device and method for the sand mixing sledge motor, in the structural design, the motor module can be independently moved out under the working requirement by combining the ascending and translation setting, compared with the traditional structural design, the reservation of maintenance operation space which needs to be considered by an original structure is not considered in maintenance, more operation steps are provided in the whole structural action compared with the traditional structure, but in the specific operation, the design has the advantage of convenience, more in maintenance, the operation is quicker, the maintenance efficiency is further improved, and meanwhile, the whole sand mixing sledge structure is more compact without more space which needs to be considered in subsequent maintenance;

2. the displacement device and the method for the sand mixing sled motor are different from the existing design in structural design, the displacement device and the method are characterized in that the displacement device and the method are of the most original mechanical structure and are carried out in a manual mode, and as outstanding description, the motor can be overhauled without additional power supply in the structural design, and compared with the design of telescopic rods such as an electronic rod, a hydraulic rod and the like, the motor cannot be maintained in the case of downtime, and corresponding overhauling and maintenance can be completed under any working condition by the traditional means.

Drawings

The invention 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 structure of the present invention;

FIG. 2 is a schematic structural view of the rear view of the present invention;

FIG. 3 is a schematic view of the elevating mechanism of the present invention;

FIG. 4 is a schematic view of the side pull mechanism of the present invention;

fig. 5 is a schematic flow chart of the process of the present invention.

The marks in the figure: 1-lifting mechanism, 11-first nut, 12-lead screw, 13-second nut, 14-third nut, 15-bolt, 2-side pull mechanism, 21-supporting seat, 22-push-pull rod, 3-motor assembly, 31-motor, 32-coupling, 33-pump, 34-mount pad, 4-sand mixing sled base.

Detailed Description

All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.

Example 1

A displacement device for a sand mixing skid motor, as shown in fig. 1 to 4, comprises a motor assembly 3 mounted on an electrically driven fracturing sand mixing skid base 4, wherein the motor assembly 3 comprises a motor 31 and a mounting seat 34, and is assembled on the sand mixing skid base 4 through the mounting seat 34;

the bottom of the mounting seat is provided with a lifting mechanism 1 for lifting the motor assembly 3, and the top of the lifting mechanism 1 is detachably assembled with the mounting seat;

one side of the mounting seat is also provided with a side pulling mechanism 2 for the displacement of the mounting seat.

In the design of structure, the elevating system 1 and the design of side that adopt in this design draw mechanism 2, under the design of dual construction, utilize the function of going up and down and the function that the side was drawn can realize the ascending of whole motor assembly and to the process that the side removed, realize that motor assembly can be independent shift out the sand mixing sledge to the effectual problem of solving the motor maintenance.

As a more specific design, the motor assembly 3 further includes a pump 33, and the motor 31 is assembled with the pump 33 through a coupling 32, based on the above specific design. In a specific design, the motor assembly 3 is adapted to the respective components as a specific structural design.

In this embodiment, a more advantageous structure is taken as a specific design, and as a specific description, the specific design is: the lifting mechanism 1 and the side pulling mechanism 2 are designed as manual structures. As a specific explanation, according to the technical development requirements, the general requirements are to perform the optimization design with the intellectualization such as the electric power, but in the design of the present structure, unlike the development of the technology, the main consideration is based on the adoption of the power source mode, and when the power source is abnormal in synchronization or the whole site is totally down and power-off, the motor assembly 3 is an important component, and the maintenance and the repair of the component are necessary. In the above-described case, in order to ensure that the motor assembly 3 can be serviced or maintained in any case, a conventional manual design is used.

In the above specific design, as a more specific design, the lifting mechanism 1 includes a first nut 11 fixedly disposed on the sand mixing sled base 4, and a screw rod 12 matched with the first nut 11, the screw rod 12 is assembled in the first nut 11, and can realize vertical displacement through thread matching, and the top of the screw rod 12 is matched with the bottom surface of the mounting seat. In this design, as a specific description, during the action of rotating the screw rod 12, the screw rod 12 can realize up-and-down displacement relative to the first nut 11, and the top of the screw rod 12 is matched with the bottom of the motor assembly 3, so that the motor assembly 3 can be lifted under the action of the screw rod 12. As a specific design, when the sand mixing sled base 4 is assembled, deep holes can be formed at positions where the first nuts are installed and matched, and a space for the screw rod to move up and down relative to the sand mixing sled base is reserved.

As a more specific design, based on safety consideration and overall structural integrity, and further design, the screw rod 12 is a double-headed screw rod 12, the lifting mechanism 1 further comprises a nut mechanism arranged at the bottom of the mounting seat, and the nut mechanism is matched with the upper part of the double-headed screw rod 12 and adjusts the height of the motor assembly 3 through the rotation of the double-headed screw rod 12. As a specific description, the structural design of this manner is effective to achieve that the distance between the nut mechanism and the first nut 11 can be increased or decreased as required for adjustment.

On the basis of the design of the specific structure, as a more specific design, the nut mechanism comprises a second nut 13 matched with the upper part of the screw rod 12 and opposite to the first nut 11 in rotation direction, and a third nut 14 fixedly arranged at the bottom of the mounting seat, wherein the third nut 14 is matched with the second nut 13 through internal and external threads, and the rotation direction of the third nut is the same as the rotation direction matched between the second nut 13 and the screw rod 12.

More specifically, the second nut 13, the third nut 14 and the screw rod 12 are provided with matched bar holes, the bolt 15 is arranged in the bar holes, and the screw rod 12 and the second nut 13 or the second nut 13 and the third nut 14 are relatively and fixedly assembled by adjusting the position of the bolt 15.

On the basis of the above specific structural design, as a more specific explanation, in the designs of the first nut 11, the second nut 13 and the screw rod 12, the main purpose is to achieve the screw rod 12 rotation on the basis of different rotation directions, the first nut 11 and the second nut 13 are synchronously moved toward or away from the middle. For example, the two end parts of the double-headed screw 12 are in the same direction, the rotation directions of the first nut 11 and the second nut 13 are opposite, and the rotation directions of the first nut 11 and the second nut 13 are continuously reversed in the rotation process of the screw 12, so that the first nut 11 and the second nut 13 are close to or far from the middle part of the screw 12.

As the opposite design, the screw rod 12 can be a bidirectional screw rod 12, threads at two ends are designed oppositely, the first nut 11 and the second nut 13 are same in rotation direction, and the first nut 11 and the second nut 13 can synchronously approach or separate from the middle when the screw rod 12 is rotated.

Further, the second nut 13, the third nut 14 and the screw rod 12 are provided with matching bar-shaped holes, and a bolt 15 is arranged in each bar-shaped hole. According to actual demands, the bolt 15 can be pushed by a tool such as a pin shaft, and the position of the strip-shaped hole can be judged according to experience when the pin shaft is inserted, so that the bolt 15 is pushed. As a specific description, the plug 15 is inserted when needed, and in normal operation, the motor assembly 3 and the sand mixing sled base are fixedly assembled, so that the position of the plug 15 is relatively not considered, and even the plug can be taken out, and the plug can be pushed in when the lifting process is needed. In addition, in a specific design, the second nut 13 and the third nut 14 need to be separated when the translation process is needed, and thus, the designs of the second nut 13 and the third nut 14 are adopted.

In the above structural design, when the second nut and the screw rod are integrated, the external thread of the second nut is equal to a part of the screw rod, in the specific design of the above operation flow, the second nut 13 and the third nut 14 need to be separated when the translation process is needed, and in the separation process, two ways can be adopted, wherein the first way is that the third nut 14 is continuously lifted until the third nut 14 is separated from the second nut 13; as a safer way, the second way is to move the third nut 14 downwards relative to the second nut 13 until it is disengaged.

On the basis of the specific design, the screw rod is used as a part of the lifting mechanism, and in the specific implementation process, the motor mounting seat is provided with a through hole for the screw rod to pass through, so that the motor assembly can move up and down along the screw rod. And the third nut 14 moves downwards relative to the second nut 13 until the third nut is separated from the second nut, and the through hole is larger than the maximum diameter of the second nut 13, so that the lifting mechanism is disassembled.

On the basis of the specific structural design, as a more specific design, the side pulling mechanism 2 comprises a supporting seat 21 arranged on one side of the sand mixing sledge base, a telescopic push-pull rod 22 capable of pulling out or pushing in the motor assembly 3 is arranged on the supporting seat 21, and one end of the push-pull rod 22 is assembled with the motor assembly 3.

Still further, a through hole is provided at the upper portion of the supporting seat 21, the push-pull rod 22 is a screw rod 12 and can penetrate through the through hole, two nuts are provided on the push-pull rod 22, and the nuts are respectively located at two ends of the through hole to be attached to the surface of the supporting seat 21.

On the basis of the specific design, as a specific description, when the telescopic rod needs to be pulled out, the inner side nut is loosened for a certain position, and the outer side nut is rotated to pull out the motor assembly 3. While during the push-in operation the opposite is done. On the basis of the design, the telescopic rod can be further locked after the motor assembly 3 is pulled out, so that the safety of the whole maintenance process is effectively ensured, and meanwhile, the maintenance efficiency is effectively improved. In particular, the method comprises the steps of,

under the effect of specific push-pull, the motor 31 is required to be shifted to be more convenient and operable, and on specific design, after the motor assembly 3 is lifted, a shifting mechanism which is convenient for the motor assembly 3 to shift can be assembled at the bottom of the mounting seat. Through the design of this structure, after lead screw 12 breaks away from with the mount pad of motor assembly, can utilize the shifter to be as the support to support and play motor assembly 3, and under the effect of push-and-pull mechanism, realize quick shift.

In the design of the shifting mechanism, more specifically, the shifting mechanism comprises a roller wheel arranged between the bottom of the mounting seat and the sand mixing sledge base; or the displacement mechanism comprises a roller track mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a pulley sliding rail mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a gear rack mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a chain wheel and chain mechanism arranged between the bottom of the mounting seat and the base of the sand mixing sledge.

In one embodiment, the displacement mechanism comprises a roller arranged at the bottom of the mounting seat; or the shifting mechanism comprises a roller arranged at the bottom of the mounting seat and a track arranged on the base of the sand mixing sledge; or the shifting mechanism comprises a pulley arranged at the bottom of the mounting seat and a sliding rail arranged on the base of the sand mixing sledge; or the shifting mechanism comprises a gear arranged at the bottom of the mounting seat and a rack arranged on the base of the sand mixing sledge; or the shifting mechanism comprises a chain wheel arranged at the bottom of the mounting seat and a chain arranged on the base of the sand mixing sledge. As another embodiment, in the design of the lifting mechanism, the mounting position of the relevant component can be changed between the mounting base and the sand mixing sled base.

As a more specific design, in order to further effectively realize the effect of the roller in the displacement process and consider the problem of the surface of the base of the sand mixing sledge, a slide rail matched with the roller can be arranged at a corresponding position on the base of the sand mixing sledge.

The roller and rail designs are generally known in the art, and the assembly slots may be configured for positioning at corresponding locations for ease of installation, so that the structure is not shown in the drawings, but does not affect the understanding and acquisition of the structure by those skilled in the art.

In the above specific structural design, as a more specific explanation, in the process of lifting and side pushing and pulling of the motor assembly 3 based on the above design, the conventional manual structural design is adopted, and is not involved in the structural design of the related external power source such as electric power source or pneumatic power source, but in the design, the structural design looks like a non-judicious choice, in the field, as a large-scale drilling equipment, intelligent design is advocated, but in the maintenance, the external power source needs to be disconnected, and of course, as a consideration, the access power source needs to be considered alone, and the comprehensive cutting and maintenance needs to be considered, while in the sand mixing sledge structure, the motor assembly 3 needs to be used as a core component for timely maintenance and repair. Then, the manual disassembly or the operation of personnel entering the frame body is considered, on the overall structure layout, the operation space is relatively limited based on the fact that the equipment is too large, time and labor are wasted, on the basis of the structure, the maintenance can be rapidly and effectively carried out in different environments, the universality is strong, and the practicability is more special.

Example 2

On the basis of the design of the embodiment 1, unlike the above specific design, there is a certain difference in the designs of the lifting mechanism 1 and the side pulling mechanism 2, in the embodiment 1, a conventional manual structure is adopted, but in the present embodiment, an intelligent structure is adopted, specifically, the lifting mechanism 1 and/or the side pulling mechanism 2 are/is an electric telescopic cylinder, a screw rod or a hydraulic telescopic cylinder.

As a further description, the lifting mechanism 1 and the side pulling mechanism 2 are electric telescopic cylinders, screw rods or hydraulic telescopic cylinders.

Example 3

Unlike in embodiment 1, when the third nut 14 and the second nut 13 are in smooth fit, or a gap is provided between the third nut 14 and the second nut 13, the second nut 13 and the third nut 14 are provided with matching bar-shaped holes, and a plug pin is arranged in the bar-shaped holes.

In this embodiment, after the shift mechanism is assembled, after the shift mechanism is used as a main support, the latch is taken out, and then the rotation of the screw rod is continuously operated, so that the screw rod is conveniently disassembled, and the disassembly of the lifting mechanism is realized.

In combination with embodiment 1 and embodiment 3, as a specific description, in a specific structural design, it is mainly considered that the lifting mechanism needs to be disassembled, and certain interference occurs under the condition of adopting an electric telescopic cylinder or a hydraulic telescopic cylinder, so that the design of the structure is adopted for facilitating the disassembly and ensuring the flatness of the sand mixing sled base, the high-efficiency operation of the whole structure can be effectively realized, and the fluency of the relevant action process is ensured, so that the traditional structure cannot be replaced by combining with the relevant automatic structure, and the technical effect cannot be brought.

Example 4

A displacement method for a sand mixing sled motor, employing a displacement device for a sand mixing sled motor 31 designed in embodiment 1, as shown in fig. 5, comprises the following steps:

s1, in an initial state, a motor assembly is placed on a sand mixing sledge base through a mounting seat and is fixed through bolts;

s2, when the motor assembly needs to be maintained, removing a connecting bolt between the mounting seat and the sand mixing sledge, and removing flange connection at an inlet and an outlet of the pump;

s3, operating the lifting mechanism, lifting the motor assembly to a target position through the lifting mechanism, at the moment, enabling the mounting seat to leave the base of the sand mixing sledge, generating a gap between the mounting seat and the sand mixing sledge, installing a shifting mechanism in the gap after generating the gap, and adjusting the lifting mechanism to enable the bottom of the mounting seat to be separated from the lifting mechanism;

s4, operating the side pulling mechanism to pull out the motor assembly and maintaining the motor assembly;

and S5, after maintenance is completed, the motor assembly is returned to the original position according to the reverse action process of the step S4-S1. .

In step S3, according to the design of the specific structure, the screw rod 12 needs to be rotated, a gap is generated between the base of the motor 31 and the base of the sand mixing sled under the action of the rotating screw rod 12, and the specified height is reached, after the specified height is reached, rollers are installed at corresponding positions, typically, 2 groups of rollers are adopted, each group of 2 rollers are designed, and then a slide rail is assembled on the upper surface of the base of the sand mixing sled, and the slide rail is in a groove structure, wherein the rollers can be arranged in the groove, and then the screw rod 12 is separated from the base of the motor 31 and is used as a support through the rollers.

In the step S4, when the telescopic rod needs to be pulled out, the nut on the inner side is loosened by a certain position, and the nut on the outer side is rotated to pull out the motor assembly 3. While during the push-in operation the opposite is done. On the basis of the design, the telescopic rod can be further locked after the motor assembly 3 is pulled out, so that the safety of the whole maintenance process is effectively ensured, and meanwhile, the maintenance efficiency is effectively improved.

The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.

Claims (10)

1. A displacement device for sand mixing sledge motor, its characterized in that: the electric fracturing sand mixing skid comprises a motor assembly arranged on an electric fracturing sand mixing skid base, wherein the motor assembly comprises a motor and a mounting seat and is assembled on the sand mixing skid base through the mounting seat;

the bottom of the mounting seat is provided with a lifting mechanism for lifting the motor assembly, and the top of the lifting mechanism is detachably assembled with the mounting seat;

a side pulling mechanism for shifting the mounting seat is further arranged on one side of the mounting seat;

after the motor assembly is lifted, a shifting mechanism which is convenient for shifting the motor assembly can be assembled at the bottom of the mounting seat;

the motor assembly further comprises a pump, and the motor is assembled with the pump through a coupling.

2. A displacement device for a sand mixing sled motor as defined in claim 1 wherein: the lifting mechanism or/and the side pulling mechanism are electric telescopic cylinders, screw rods or hydraulic telescopic cylinders.

3. A displacement device for a sand mixing sled motor as defined in claim 1 wherein: the lifting mechanism comprises a first nut fixedly arranged on the sand mixing sledge base and a screw rod matched with the first nut, wherein the screw rod is assembled in the first nut and can realize up-and-down displacement through thread matching, and the top of the screw rod is matched with the bottom surface of the mounting seat.

4. A displacement device for a sand mixing sled motor as defined in claim 3 wherein: the screw rod is a double-end screw rod, the lifting mechanism further comprises a nut mechanism arranged at the bottom of the mounting seat, the nut mechanism is matched with the upper portion of the double-end screw rod, and the height of the motor assembly is adjusted through rotation of the double-end screw rod.

5. The displacement device for a sand mixing sled motor of claim 4 wherein: the nut mechanism comprises a second nut which is matched with the upper part of the screw rod and is opposite to the first nut in rotation direction, and a third nut which is fixedly arranged at the bottom of the mounting seat;

the third nut is matched with the second nut through internal and external threads, the screwing direction of the third nut is the same as that of the second nut and the screw rod, or the third nut is in smooth surface fit with the second nut, or a gap is reserved between the third nut and the second nut.

6. The displacement device for a sand mixing sled motor of claim 5 wherein: when the third nut is matched with the second nut through internal and external threads, the screwing direction of the third nut is the same as that of the second nut and the screw rod, the second nut, the third nut and the screw rod are provided with matched strip-shaped holes, bolts are arranged in the strip-shaped holes, and the screw rod and the second nut are relatively and fixedly assembled by adjusting the positions of the bolts, or the second nut and the third nut are relatively and fixedly assembled;

when the third nut is in smooth surface fit with the second nut or a gap is reserved between the third nut and the second nut, the second nut and the third nut are provided with matched strip-shaped holes, and a bolt is arranged in each strip-shaped hole.

7. A displacement device for a sand mixing sled motor as defined in claim 1 wherein: the side pulling mechanism comprises a supporting seat arranged on one side of the sand mixing sledge base, a telescopic push-pull rod capable of pulling out or pushing in the motor assembly is arranged on the supporting seat, and one end of the push-pull rod is assembled with the motor assembly.

8. The displacement device for a sand mixing sled motor of claim 7 wherein: the upper portion of supporting seat is provided with the through-hole, the push-and-pull rod is the lead screw and can run through the through-hole be provided with two nuts on the push-and-pull rod to be located the both ends portion of through-hole respectively in order to laminate with the supporting seat side.

9. A displacement device for a sand mixing sled motor as defined in claim 1 wherein: the shifting mechanism comprises a roller arranged between the bottom of the mounting seat and the base of the sand mixing sledge; or the displacement mechanism comprises a roller track mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a pulley sliding rail mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a gear rack mechanism arranged between the bottom of the mounting seat and the sand mixing sledge base; or the shifting mechanism comprises a chain wheel and chain mechanism arranged between the bottom of the mounting seat and the base of the sand mixing sledge.

10. A displacement method for a sand mixing sled motor, employing a displacement device for a sand mixing sled motor according to any one of claims 1-9, characterized in that: the method comprises the following steps:

s1, in an initial state, a motor assembly is placed on a sand mixing sledge base through a mounting seat and is fixed through bolts;

s2, when the motor assembly needs to be maintained, removing a connecting bolt between the mounting seat and the sand mixing sledge, and removing flange connection at an inlet and an outlet of the pump;

s3, operating the lifting mechanism, lifting the motor assembly to a target position through the lifting mechanism, at the moment, enabling the mounting seat to leave the base of the sand mixing sledge, generating a gap between the mounting seat and the sand mixing sledge, installing a shifting mechanism in the gap after generating the gap, and adjusting the lifting mechanism to enable the bottom of the mounting seat to be separated from the lifting mechanism;

s4, operating the side pulling mechanism to pull out the motor assembly and maintaining the motor assembly;

and S5, after maintenance is completed, the motor assembly is returned to the original position according to the reverse action process of the step S4-S1.