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

A shifting device and method for sand mixing sled motor

Technical field

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

Background technique

The electric-driven fracturing sand mixing skid adopts a variable frequency motor and a closed design to achieve rapid and accurate control of liquid and fracturing sand and good protection against impurities and rainwater, and can meet the fracturing process requirements under complex working conditions; it can be realized 24-hour continuous operation, high safety, greatly reducing labor intensity, realizing automatic control and integrated operation of sand mixing equipment and sand storage equipment, which can greatly improve the efficiency and quality of fracturing sand mixing operations and reduce operating costs. It is now the ideal There are advanced equipment of sand mixing system.

As the power source of the electric fracturing sand mixing sled, the difficulty of maintenance of the motor determines the working efficiency and quality of the electric fracturing sand mixing sled. The motor maintenance of the existing electric-driven fracturing sand mixing sled has the following technical defects:

In the existing electric-driven fracturing sand mixing skid, when the motor needs maintenance or a fault occurs and needs to be repaired, due to the limited operating space, the movable decking or bench above the motor assembly can only be removed, and then the pump Dismantle the inlet and outlet flanges, and use a crane to lift the entire motor assembly to the ground for related operations. After the maintenance or overhaul work is completed, hoist it back and reinstall it. The whole process takes a long time, is troublesome to operate, and requires the use of a crane. It is not only costly but also low in work efficiency, which affects the construction progress of the fracturing operation.

Contents of the invention

The object of the present invention is to: in view of the above-mentioned existing problems, provide a shifting device and method for a sand mixing sled motor. The device and method are designed to have a simple structure, convenient operation, and more importantly, do not require any Other power supplies, etc., can be completed directly through manual operation, effectively improving the efficiency of motor maintenance.

The technical solutions adopted by the present invention are as follows:

A shifting device for a sand mixing sled motor, characterized by: including a motor assembly installed on the base of an electrically driven fracturing sand mixing sled. The motor assembly includes a motor and a mounting base, and is assembled through the mounting base. On the base of the sand mixing sled;

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

One side of the mounting base is also provided with a side pull mechanism for displacing the mounting base.

Further, the motor assembly also includes a pump, and the motor is assembled with the pump through a coupling.

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

Further, the lifting mechanism includes a first nut fixedly arranged on the base of the sand mixing sled, and a screw rod matching the first nut. The screw rod is assembled in the first nut and can achieve up and down displacement through thread matching. The top of the screw rod matches the bottom surface of the mounting base.

Furthermore, the screw is a double-headed screw, and the lifting mechanism also includes a nut mechanism provided at the bottom of the mounting base. The nut mechanism is matched with the upper part of the double-headed screw and is adjusted by the rotation of the double-headed screw. The height of the motor assembly.

Further, the nut mechanism includes a second nut that matches the upper part of the screw rod and rotates in the opposite direction to the first nut, and a third nut that is fixedly provided at the bottom of the mounting base. The third nut and the second nut are connected through internal and external threads. Matching, the direction of rotation is the same as the direction of matching between the second nut and the screw rod.

Further, the second nut, the third nut and the screw rod are provided with matching strip holes, and a latch is provided in the strip hole. By adjusting the position of the latch, the screw rod and the second nut, or the second nut and the screw rod are connected. The third nut is relatively fixedly assembled.

Further, the side pulling mechanism includes a support seat provided on one side of the sand mixing sled base. The support seat is provided with a telescopic push-pull rod that can pull the motor assembly out or push it in. The push-pull rod is One end is assembled with the motor assembly.

Further, a through hole is provided on the upper part of the support base, and the push-pull rod is a screw rod and can penetrate the through hole. Two nuts are provided on the push-pull rod and are respectively located at both ends of the through hole to connect with the through hole. Supportive seat fit.

Furthermore, when the motor assembly is lifted, a shifting mechanism can be installed at the bottom of the mounting base to facilitate the displacement of the motor assembly.

Further, the shifting mechanism includes a roller disposed between the bottom of the mounting base and the base of the sand mixing sled; or the shifting mechanism includes a roller track mechanism disposed between the bottom of the mounting base and the base of the sand mixing sled; or the The displacement mechanism includes a pulley rail mechanism disposed between the bottom of the mounting base and the base of the sand mixing sled; or the shifting mechanism includes a rack and pinion mechanism disposed between the bottom of the mounting base and the base of the sand mixing sled; or the The shifting mechanism includes a sprocket chain mechanism disposed between the bottom of the mounting base and the base of the sand mixing sled.

A method for shifting a sand mixing sled motor, using the above-mentioned shifting device for a sand mixing sled motor, including the following steps:

S1. In the initial state, the motor assembly is placed on the base of the sand mixing sled through the mounting base and fixed with bolts;

S2. When the motor assembly needs maintenance, remove the connecting bolts between the mounting base and the sand mixing skid, and remove the flange connection at the pump inlet and outlet;

S3. Operate the lifting mechanism, and raise the motor assembly to the target position through the lifting mechanism. At this time, the mounting base has left the base of the sand mixing sled, and a gap is generated between the sand mixing sled and the sand mixing sled. After the gap is generated, install the mobile device in the gap. position mechanism, adjust the lifting mechanism so that the bottom of the mounting base is separated from the lifting mechanism;

S4. Operate the side pull mechanism to pull out the motor assembly and perform maintenance;

S5. After the repair is completed, follow the reverse action process of steps S4-S1 to return the motor assembly to its original position.

In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

1. A shifting device and method for a sand mixing sled motor of the present invention. In terms of structural design, combined with the lifting and translation settings, the motor module can be moved out individually under work requirements. Compared with traditional methods in terms of maintenance, The structural design does not need to consider the reservation of maintenance operation space that the original structure needs to consider. In terms of the entire structural movement, it has more operating steps than the traditional structure. However, in terms of specific operations, this design has the advantage of convenience and is more In terms of maintenance, the operation is faster, which further improves the maintenance efficiency. It also makes the entire sand mixing sled more compact, eliminating the need to consider more space for subsequent maintenance;

2. A shifting device and method for a sand mixing sled motor of the present invention. In terms of structural design, it is different from existing designs in that this design adopts the most original mechanical structure and is carried out manually. , as a prominent explanation, the design of this structure does not require additional power supply to complete the maintenance of the motor. Compared with the design of telescopic rods such as electronics and hydraulics, the motor cannot be maintained in the event of downtime. Through this traditional method, corresponding inspection and maintenance can be completed under any working conditions.

Description of the drawings

The invention will be explained by way of example and with reference to the accompanying drawing, in which:

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a schematic structural diagram of the rear view of the present invention;

Figure 3 is a schematic structural diagram of the lifting mechanism of the present invention;

Figure 4 is a schematic structural diagram of the side pulling mechanism of the present invention;

Figure 5 is a schematic flow diagram of the process of the present invention.

Markings in the figure: 1-Lifting mechanism, 11-First nut, 12-Screw rod, 13-Second nut, 14-Third nut, 15-Latch, 2-Side pull mechanism, 21-Support seat, 22-Push Tie rod, 3-motor assembly, 31-motor, 32-coupling, 33-pump, 34-mounting base, 4-sand mixing sled base.

Detailed ways

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

Any feature disclosed in this specification may be replaced by other equivalent or alternative features having similar purposes, unless specifically stated. That is, unless otherwise stated, each feature is only one example in a series of equivalent or similar features.

Example 1

A shifting device for a sand mixing sled motor, as shown in Figures 1 to 4, includes a motor assembly 3 installed on the base 4 of an electrically driven fracturing sand mixing sled, and the motor assembly 3 includes a motor 31 And the mounting seat 34, and is assembled on the sand mixing skid base 4 through the mounting seat 34;

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

A side pull mechanism 2 for displacing the mounting base is also provided on one side of the mounting base.

In terms of structural design, the design of the lifting mechanism 1 and the side pulling mechanism 2 used in this design is a dual-structure design. The lifting function and the side pulling function can be used to realize the rise and side movement of the entire motor assembly. During the moving process, the motor assembly can be moved out of the sand mixing sled independently, thus effectively solving the problem of motor maintenance.

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

In this embodiment, a more advantageous structure is used as a specific design. As a specific explanation, the specific design is: both the lifting mechanism 1 and the side pulling mechanism 2 are designed as manual structures. As a special note, according to the requirements of technological development, the usual requirements are to optimize the design with electric and other intelligence. However, in the design of this structure, it is relatively different from the development of technology. The main consideration is based on the use of The way of power source, when the power source synchronization is abnormal or the entire site is completely down and power outage, comprehensive maintenance and inspection are required, and the motor assembly 3 is an important component, and inspection and maintenance of this part are necessary. of. Considering the above situation, in order to ensure that the motor assembly 3 can be inspected or maintained under any circumstances, a traditional manual structural design is adopted.

Based on the above specific design, as a more specific design, the lifting mechanism 1 includes a first nut 11 fixedly provided on the sand mixing sled base 4, and a screw rod 12 matching the first nut 11. The screw rod 12 is assembled in the first nut 11 to achieve up and down displacement through thread matching, and the top of the screw rod 12 matches the bottom surface of the mounting base. In this design, as a specific description, during the action of rotating the screw rod 12, the screw rod 12 can achieve up and down displacement relative to the first nut 11, and the top of the screw rod 12 is used to match the bottom of the motor assembly 3. Under the action of the screw rod 12, the motor assembly 3 can be raised and lowered. As a specific design, when assembling the sand mixing sled base 4, you can consider opening a deep hole at the position where the first nut is installed and matched, and leaving space for the screw rod to move up and down relative to the sand mixing sled base.

As a more specific design, based on safety considerations and the integrity of the entire structure, a further design is that the screw rod 12 is a double-headed screw rod 12, and the lifting mechanism 1 also includes a nut mechanism provided at the bottom of the mounting base. , the nut mechanism is matched with the upper part of the double-ended screw rod 12, and the height of the motor assembly 3 is adjusted by the rotation of the double-ended screw rod 12. As a specific description, the structural design in this manner effectively enables the distance between the nut mechanism and the first nut 11 to be increased or decreased as required.

Based on the design of the above specific structure, as a more specific design, the nut mechanism includes a second nut 13 that matches the upper part of the screw rod 12 and rotates in the opposite direction to the first nut 11, and a third nut 13 fixedly provided at the bottom of the mounting base. The third nut 14 is matched with the second nut 13 through internal and external threads, and its rotation direction is the same as the matching rotation direction 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 matching strip holes, and a latch 15 is arranged in the strip hole. By adjusting the position of the latch 15, the screw rod 12 and the second screw rod 12 are connected. The nut 13, or the second nut 13 and the third nut 14 are relatively fixedly assembled.

Based on the above specific structural design, as a more specific explanation, the main purpose of the design of the first nut 11, the second nut 13 and the screw rod 12 is to realize the rotation of the screw rod 12 based on different rotation directions. The first nut 11 and the second nut 13 move toward or away from the middle part simultaneously. For example, the two ends of the double-headed screw 12 are in the same direction, and the first nut 11 and the second nut 13 have opposite directions of rotation. During the rotation of the screw 12, they continue to reverse the direction of rotation, so that the first nut 11 , the second nut 13 is close to or away from the middle of the screw rod 12 .

As an opposite design, the screw rod 12 can be a two-way screw rod 12 with opposite threads at both ends. The first nut 11 and the second nut 13 rotate in the same direction. When the screw rod 12 is rotated, the first nut 11 and the second nut 13 can rotate. The nut 13 moves toward or away from the middle synchronously.

Furthermore, the second nut 13, the third nut 14 and the screw rod 12 are provided with matching strip holes, and the latch 15 is provided in the strip holes. According to actual needs, tools such as pins can be used to push the latch 15. When the pin is inserted, the position of the strip hole can be judged based on experience, thereby pushing the latch 15 in. As a specific description, the latch 15 is inserted when needed, and during normal operation, the motor assembly 3 and the sand mixing sled base are fixedly assembled. Relatively speaking, the position of the latch 15 does not need to be considered, and it can even be removed. Push it in when the lifting process is required. In addition, in terms of specific design, the second nut 13 and the third nut 14 need to be separated when the translation process is required. Therefore, the design of the second nut 13 and the third nut 14 is adopted.

In the above structural design, when the second nut and the screw are integrated, the external thread of the second nut is equivalent to a part of the screw. In the specific design of the above operation process, the second nut 13 and the third nut 14 are required to be It is necessary to disengage during the translation process. During the disengagement process, two methods can be adopted. The first is to continue to raise the third nut 14 until the third nut 14 is separated from the second nut 13. As a safer method, the second The method is to move the third nut 14 downward relative to the second nut 13 until it is disengaged from the second nut.

Based on the above specific design, the screw rod is used as part of the lifting mechanism. During the specific implementation process, the motor mounting base 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. . When the third nut 14 moves downward relative to the second nut 13 until it is disengaged from the second nut, the through hole is larger than the maximum diameter of the second nut 13, thereby realizing the disassembly of the lifting mechanism.

Based on the above specific structural design, as a more specific design, the side pulling mechanism 2 includes a support base 21 provided on one side of the sand mixing sled base. The support base 21 is provided with a structure that can pull the motor assembly 3 A telescopic push-pull rod 22 can be pushed out or pushed in. One end of the push-pull rod 22 is assembled with the motor assembly 3.

In a further design, the upper part of the support base 21 is provided with a through hole. The push-pull rod 22 is a screw rod 12 and can pass through the through hole. Two nuts are provided on the push-pull rod 22 and are respectively located in the through hole. The two ends are in contact with the support base 21.

Based on the above specific design, as a specific description, when it is necessary to pull out the telescopic rod, loosen the inner nut to a certain position and rotate the outer nut to pull out the motor assembly 3. During the pushing operation, the opposite action is performed. Based on this design, the telescopic rod can be further locked after pulling out the motor assembly 3, which not only effectively ensures the safety of the entire maintenance process, but also effectively improves maintenance efficiency. specific,

Under the action of specific push and pull, it is necessary to achieve more convenient and operable shifting of the motor 31. In terms of specific design, when the motor assembly 3 is lifted, it can also be assembled at the bottom of the mounting base to facilitate the motor assembly. A 3-shift shifting mechanism. Through the design of this structure, after the screw rod 12 is separated from the mounting seat of the motor assembly, the displacement mechanism can be used as a support to support the motor assembly 3, and under the action of the push-pull mechanism, rapid displacement can be achieved.

In terms of the design of the shifting mechanism, more specifically, the shifting mechanism includes a roller disposed between the bottom of the mounting base and the base of the sand mixing sled; or the shifting mechanism includes a roller disposed between the bottom of the mounting base and the base of the sand mixing sled. a roller track mechanism between; or the shifting mechanism includes a pulley rail mechanism disposed between the bottom of the mounting base and the sand mixing sled base; or the shifting mechanism includes a pulley rail mechanism disposed between the bottom of the mounting base and the sand mixing sled base; a gear and rack mechanism between; or the shifting mechanism includes a sprocket chain mechanism disposed between the bottom of the mounting base and the base of the sand mixing sled.

In one embodiment, the displacement mechanism includes a roller provided at the bottom of the installation base; or the displacement mechanism includes a roller provided at the bottom of the installation base, and a track provided on the base of the sand mixing sled; or the The shifting mechanism includes a pulley provided at the bottom of the mounting base and a slide rail provided on the base of the sand mixing sled; or the shifting mechanism includes a gear provided at the bottom of the mounting base and teeth provided on the base of the sand mixing sled. or the shifting mechanism includes a sprocket arranged at the bottom of the mounting base, and a chain arranged on the base of the sand mixing sled. As another embodiment, in the design of the above-mentioned lifting mechanism, the installation position of the relevant components can be replaced between the installation seat and the sand mixing sled base.

As a more specific design, in order to further effectively realize the effect of the rollers in the displacement process, and taking into account the problem of the surface of the sand mixing sled base, a further design can be provided on the corresponding position of the sand mixing sled base to match the rollers. Slide rail.

The design of the above-mentioned rollers and slide rails has a relatively common structure in this field. At the same time, in order to facilitate installation, assembly grooves can be designed at corresponding positions for positioning. Therefore, in the specific presentation of this structure, it is not shown in the illustration. Not shown, however, does not affect the understanding and acquisition of the structure by those skilled in the art.

As for the above specific structural design, as a more specific explanation, on the basis of the above design, during the lifting and side pushing and pulling of the motor assembly 3, a traditional manual structural design is adopted, and no relevant electric or electric components are involved. The structural design of external power sources such as pneumatics, etc., and this design seems to be an unwise choice in structural design. In this field, as the field of large-scale drilling equipment, intelligent design is also advocated, but in During maintenance, the external power source needs to be disconnected. Of course, as a consideration, the power source can be separately considered, and full cut-off maintenance needs to be considered. In the sand mixing sled structure, the motor assembly 3 is also a core component and needs to be Timely inspection and maintenance. Then, it is necessary to consider manual disassembly or personnel entering the frame for operation. In terms of the overall structural layout, the equipment is too large and the operable space is relatively limited, which is time-consuming and labor-intensive. On the basis of the above structure, it can operate in different environments. Carry out maintenance quickly and effectively, with strong versatility and practicality.

Example 2

Based on the design of Embodiment 1, what is different from the above-mentioned specific design is that there are certain differences in the design of the lifting mechanism 1 and the side pull mechanism 2. In Embodiment 1, it is a traditional manual structure, while in this embodiment , an intelligent structure is adopted. Specifically, the lifting mechanism 1 and/or the side pulling mechanism 2 are electric telescopic cylinders, screw rods or hydraulic telescopic cylinders.

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

Example 3

What is different from Embodiment 1 is that when the third nut 14 and the second nut 13 have a smooth fit, or there is a gap between the third nut 14 and the second nut 13 , the second nut 13 And the third nut 14 is provided with a matching strip hole, and a latch is provided in the strip hole.

In this embodiment, after assembling the shift mechanism and using the shift mechanism as the main support, the latch is taken out, and then the screw rod is continued to rotate to facilitate the removal of the screw rod, thereby realizing the disassembly of the lifting mechanism.

Combining Embodiment 1 and Embodiment 3, as a specific description, in terms of specific structural design, the main consideration is that the lifting mechanism needs to be disassembled, and certain problems will occur when using an electric telescopic cylinder or a hydraulic telescopic cylinder. In order to facilitate disassembly and ensure the flatness of the sand mixing sled base, the structure is designed to effectively achieve high-efficiency operation of the entire structure and ensure the smoothness of the relevant action processes. This is a traditional structure combined with related automation structures. It is irreplaceable and cannot bring about technical effects.

Example 4

A method for shifting the sand mixing sled motor, using a shifting device for the sand mixing sled motor 31 designed in Embodiment 1, as shown in Figure 5, including the following steps:

S1. In the initial state, the motor assembly is placed on the base of the sand mixing sled through the mounting base and fixed with bolts;

S2. When the motor assembly needs maintenance, remove the connecting bolts between the mounting base and the sand mixing skid, and remove the flange connection at the pump inlet and outlet;

S3. Operate the lifting mechanism, and raise the motor assembly to the target position through the lifting mechanism. At this time, the mounting base has left the base of the sand mixing sled, and a gap is generated between the sand mixing sled and the sand mixing sled. After the gap is generated, install the mobile device in the gap. position mechanism, adjust the lifting mechanism so that the bottom of the mounting base is separated from the lifting mechanism;

S4. Operate the side pull mechanism to pull out the motor assembly and perform maintenance;

S5. After the repair is completed, follow the reverse action process of steps S4-S1 to return the motor assembly to its original position. .

In step S3, according to the design of the specific structure, the screw rod 12 needs to be rotated. Under the action of the rotating screw rod 12, a gap is generated between the base of the motor 31 and the base of the sand mixing sled, and reaches a specified height. After reaching a certain height, Install the rollers at the corresponding positions. Usually, the rollers are designed in 2 sets of 2 each, and then a slide rail is assembled on the upper surface of the sand mixing sled base. The slide rail has a groove structure, and the rollers can be set in the groove. Then the screw rod 12 is separated from the base of the motor 31 and supported by the roller.

In step S4 of the mounting base, when it is necessary to pull out the telescopic rod, loosen the inner nut to a certain position and rotate the outer nut to pull out the motor assembly 3. During the pushing operation, the opposite action is performed. Based on this design, the telescopic rod can be further locked after pulling out the motor assembly 3, which not only effectively ensures the safety of the entire maintenance process, but also effectively improves maintenance efficiency.

The present invention is not limited to the specific embodiments described above. The invention extends to any new features or any new combinations disclosed in this specification, as well as to any new method or process steps disclosed or any new combinations.

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.