CN116044748A - Screw pump - Google Patents

Abstract

The invention relates to a screw pump, which comprises a pump body, wherein a motor is arranged on the pump body, a feed pipe and a discharge pipe are respectively arranged at two ends of the pump body, a screw is rotationally connected with the pump body, the screw pump also comprises an oil sludge stirring and pushing device, and the oil sludge stirring and pushing device comprises: the hopper is arranged on the outer side of the pump body and is rotationally connected with the discharge pipe, and a trough is fixedly communicated below the hopper; the stirring mechanism is used for fully stirring the dirty oil sludge; the transmission mechanism is used for driving the stirring mechanism to rotate; the pushing mechanism is arranged on the stirring mechanism and used for pushing the oil sludge to the inlet of the feeding pipe. According to the invention, the stirring rod is arranged on the rotating sleeve, so that the stirring rod is driven to rotate along with the rotating sleeve when the rotating sleeve rotates, and simultaneously rotates, thereby scattering the sludge caking entering the inlet of the screw pump and preventing the screw pump from being blocked.

Description

a screw pump

technical field

The invention relates to the technical field of screw pumps, in particular to a screw pump.

Background technique

With the continuous improvement of science and technology, people's demand for oil continues to grow, but in the process of oil processing and production, a large amount of sludge will be formed, and its composition is complex, which will cause serious harm to the air, soil and water in the environment , in the prior art, it is generally pumped with a screw pump, but the following problems often occur when the screw pump is used for pumping:

1. Due to the poor mobile phase of sludge, not only the efficiency is low when the screw pump pumps it, but also the phenomenon of cavitation often occurs, which shortens the working life of the screw pump;

2. Since the sludge is easy to agglomerate, it often leads to blockage of the screw pump, resulting in poor pumping and affecting normal pumping work;

3. In the prior art, in order to improve the fluidity of the sludge, a large amount of water needs to be injected into it, which will consume a large amount of water resources and cause a waste of resources;

4. Due to the poor fluidity of the sludge, the screw pump cannot clean all the sludge in the collection tank when transporting the sludge, but it needs to manually move the hose connected to the inlet to complete.

Contents of the invention

Based on this, it is necessary to provide a screw pump capable of stirring the sludge and preventing the cavitation phenomenon in order to solve the above problems.

The invention discloses a screw pump, which comprises a pump body, on which a motor is installed, and two ends of the pump body are respectively provided with a feed pipe and a discharge pipe, and the pump body is rotatably connected with a screw, and One end of the screw passes through the pump body and is fixedly connected to the output end of the motor. The screw pump also includes a sludge stirring and pushing device arranged on the pump body, and the sludge stirring and pushing device includes: The hopper is arranged on the outside of the pump body and is connected to the discharge pipe in rotation. The lower part of the hopper is fixedly connected with a trough, and the upper opening of the hopper is fixedly connected with an inner ring gear; the stirring mechanism is arranged on the The feeding pipe, the stirring mechanism is used to fully stir the sludge; the transmission mechanism is arranged between the motor and the stirring mechanism, and the transmission mechanism is used to drive the stirring mechanism to rotate; push The mechanism is arranged on the stirring mechanism, and the pushing mechanism is used to push the sludge to the inlet of the feeding pipe.

In one of the embodiments, the screw is divided into a first screw and a second screw that are rotatably connected to the pump body, one end of the first screw passes through the pump body and is fixedly connected with a first gear, and The first screw is fixedly connected to the output end of the motor, and one end of the second screw passes through the pump body and is fixedly connected with a second gear meshing with the first gear.

In one of the embodiments, the stirring mechanism includes: a rotating sleeve, which is rotatably connected to the feed pipe, and a third gear meshed with the inner ring gear is fixedly connected to the lower edge of the rotating sleeve; There are three rods that are rotatably connected to the rotating sleeve, each of the stirring rods is provided with a flow channel at the central axis, and each of the stirring rods is provided with a number of stirring rods located outside the flow channel; The fourth gear is fixedly connected to the feed pipe, the fourth gear is meshed with the fifth gear, the sixth gear and the seventh gear, and the fifth gear, the sixth gear and the seventh gear are fixedly connected respectively on the three said stir bars.

In one embodiment, there are four stirring rods on each stirring rod, and the four stirring rods are distributed in a circular array around the flow channel.

In one embodiment, the three stirring rods are distributed in an equilateral triangle.

In one of the embodiments, the transmission mechanism includes a driving bevel gear fixedly connected to the other output end of the motor, the driving bevel gear is meshed with a driven bevel gear that is rotatably connected to the pump body, and the driven bevel gear is rotatably connected to the pump body. The movable bevel gear is coaxially and fixedly connected with a first pulley, and the first pulley is connected with a second pulley fixedly connected with the upper end of the rotating sleeve through a belt.

In one of the embodiments, the pushing mechanism includes: a rotating cylinder, which is rotatably connected to the rotating sleeve, and an eighth gear meshed with the fourth gear is fixedly connected to the rotating cylinder, and the rotating cylinder The inner wall of the inner wall is provided with a track groove, and the track groove includes a first groove, a first spiral groove, a second groove and a second spiral groove connected end to end in sequence, and a connecting rod is slidably connected in the rotating cylinder, and the connecting rod The rod is fixedly connected with a protrusion slidingly connected with the track groove, and the lower end of the connecting rod is fixedly connected with a moving ring; the connecting ring is rotatably connected to the feeding pipe, and the connecting ring is slidably connected with a sliding rod , the sliding rod is fixedly connected to one end of the moving ring; the pushing plate is slidably connected to the moving ring, a first spring is installed between the pushing plate and the moving ring, and the inner part of the pushing plate A positioning mechanism is arranged between the end and the moving ring, and the end of the pushing plate located outside the moving ring is rotatably connected to a telescopic rod; the telescopic cylinder is rotatably connected to the rotating sleeve, and the telescopic cylinder is connected to the The telescopic rod is slidably connected, and a second spring for pushing the telescopic rod outward is installed between the telescopic cylinder and the telescopic rod.

In one of the embodiments, the positioning mechanism includes a positioning pin slidably connected to the moving ring and a positioning groove provided on the pushing plate, one end of the positioning pin is fixedly connected with a positioning block, and the A third spring for pushing the positioning block into the positioning groove is installed between the positioning pin and the moving ring. the lever that touches the link ring described above.

In one of the embodiments, the side of the positioning block facing the positioning groove is provided with a guiding slope.

Beneficial effects of the present invention:

1. By setting the stirring rod on the rotating sleeve, when the rotating sleeve is rotating, the stirring rod is not only driven to follow the rotation of the rotating sleeve, but also to rotate itself, and then break up the sludge agglomeration entering the inlet of the screw pump to prevent it from clogging Progressive cavity pump.

2. By setting a rotating cylinder with track grooves on the rotating sleeve, and through gear cooperation, when the rotating sleeve rotates, the rotating cylinder rotates on its own. Due to the cooperation between the protrusion and the orbital groove, the connecting rod is driven to reciprocate up and down when the rotating cylinder rotates At the same time, it is driven by the telescopic rod and the second spring, and the cooperation between the moving ring and the pushing plate, plus the cooperation of the positioning mechanism, so that when the connecting rod is lowered, the moving ring and the pushing plate can be driven down, so in Under the action of the telescopic rod, push the pusher plate to move into the moving ring until the pusher plate moves directly below the feeding pipe. When the connecting rod moves upwards, the moving ring drives the pushing plate to move upwards, and it will be placed in the feeding pipe. The sludge at the bottom is pushed to the inlet of the feed pipe, so as to avoid air suction, and when the moving ring touches the feed inlet, the positioning mechanism releases the restriction, and the telescopic rod is pushed out under the action of the second spring, so that the pusher The material plate leaves the feed pipe to avoid blocking the material from entering. During the continuous rotation of the rotating sleeve, the material return work is continuously completed to prevent air suction and ensure the normal operation of the screw pump.

3. By setting a flow channel in the stirring rod, when the stirring rod rotates, water is passed into the sludge through the flow channel, and the stirring of the stirring rod is used to mix the sludge and water to improve the fluidity of the sludge, and The water flows out through a large number of water outlet holes, so that the mixing area of water and sludge is enlarged, and then the water energy and sludge are fully mixed to avoid waste of water resources.

4. Through the gear and the transmission mode, when the rotating sleeve is rotating, it can drive the pump body to rotate around the axis of the trough, and then drive the feeding pipe part to rotate, which can not only fully stir the sludge in the hopper , and can also absorb the sludge at various positions in the trough, and can transport all the sludge.

Description of drawings

Fig. 1 is a sectional view of the present invention;

Fig. 2 is the sectional view of A-A direction in Fig. 1 of the present invention;

Fig. 3 is the sectional view of B-B direction in Fig. 1 of the present invention;

Fig. 4 is the sectional view of C-C direction in Fig. 3 of the present invention;

Fig. 5 is an enlarged view at I place in Fig. 1 of the present invention;

Fig. 6 is the sectional view of D-D direction in Fig. 5 of the present invention;

Figure 7 is an enlarged view of II in Figure 5 of the present invention;

Fig. 8 is a three-dimensional view of the interior of the rotary drum of the present invention;

Fig. 9 is a three-dimensional view from another direction of the interior of the rotary drum of the present invention.

In the figure, the pump body 1, the first screw rod 11, the second screw rod 12, the first gear 13, the second gear 14, the motor 15, the driving bevel gear 16, the driven bevel gear 17, the feed pipe 18, the fourth gear 181 , discharge pipe 19, material trough 21, hopper 22, ring gear 23, first pulley 31, belt 32, second pulley 33, rotating sleeve 41, third gear 42, stirring rod 43, stirring rod 431, runner 432, fifth gear 441, sixth gear 442, seventh gear 443, eighth gear 444, connecting ring 45, moving ring 461, connecting rod 4611, protrusion 4612, sliding rod 4613, pushing plate 462, positioning groove 4621 , the first spring 463, the rotating cylinder 5, the first groove 51, the first spiral groove 52, the second groove 53, the second spiral groove 54, the telescopic cylinder 61, the chute 611, the telescopic rod 62, the slider 621, The second spring 63 , the positioning pin 71 , the control rod 711 , the positioning block 712 , and the third spring 72 .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that when a component is said to be "mounted on" another component, it may be directly on the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be set directly on the other component or there may be an intervening component at the same time. When a component is said to be "fixed" to another component, it may be directly fixed to the other component or there may be an intervening component at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in Figure 1, a screw pump includes a pump body 1, a motor 15 is installed on the pump body 1, and a feed pipe 18 and a discharge pipe 19 are respectively arranged at the two ends of the pump body 1. The pump body 1 is rotatably connected with a screw, and one end of the screw passes through the pump body 1 and is fixedly connected with the output end of the motor 15. The screw pump also includes a The sludge stirring and pushing device, the sludge stirring and pushing device includes: a hopper 22, which is arranged on the outside of the pump body 1 and connected to the discharge pipe 9 in rotation, and the bottom of the hopper 22 is fixedly connected with a trough 21, the The upper opening of the trough 21 is fixedly connected with an inner ring gear 23; the stirring mechanism is arranged on the feed pipe 18, and the stirring mechanism is used to fully stir the sludge; the transmission mechanism is arranged on the motor 15 and Between the stirring mechanisms, the transmission mechanism is used to drive the stirring mechanism to rotate; the pushing mechanism is arranged on the stirring mechanism, and the pushing mechanism is used to push the sludge to the feed pipe 18. import office.

Preferably, as shown in FIG. 2, the screw is divided into a first screw 11 and a second screw 12 that are rotatably connected to the pump body 1, and one end of the first screw 11 passes through the pump body 1 and is fixed A first gear 13 is connected, and the first screw 11 is fixedly connected to the output end of the motor 15, and one end of the second screw 12 passes through the pump body 1 and is fixedly connected with the first gear. 13 meshes with the second gear 14 .

Preferably, as shown in Fig. 1, Fig. 3 and Fig. 5, the stirring mechanism includes: a rotating sleeve 41, which is rotatably connected to the feed pipe 18, and the lower end edge of the rotating sleeve 41 is fixedly connected with the The third gear 42 meshed with the inner ring gear 23; the stirring rod 43 is rotatably connected to the rotating sleeve 41 and three are arranged, and the central axis of each stirring rod 43 is provided with a flow channel 432, and each The stirring rod 43 is provided with several stirring rods 431 on the outside of the flow channel 432; the fourth gear 181 is fixedly connected to the feed pipe 18, and the fourth gear 181 is meshed with a fifth gear 441, The sixth gear 442 and the seventh gear 443 , the fifth gear 441 , the sixth gear 442 and the seventh gear 443 are respectively fixedly connected to the three stirring rods 43 .

It is worth mentioning that, as shown in FIG. 5 , the flow channel 432 is connected with a plurality of water outlet holes distributed in an array.

Preferably, as shown in FIG. 3 and FIG. 4 , there are four stirring rods 431 on each of the stirring rods 43 , and the four stirring rods 431 form a circle around the flow channel 432 Array distribution.

Preferably, as shown in FIG. 3 and FIG. 5 , the three stirring rods 43 are distributed in an equilateral triangle.

Preferably, as shown in Fig. 2 and Fig. 5, the transmission mechanism includes a driving bevel gear 16 fixedly connected to the other output end of the motor 15, and the driving bevel gear 16 is meshed with a rotation connection with the pump body 1 The driven bevel gear 17 is coaxially fixedly connected with a first pulley 31, and the first pulley 31 is connected with a second pulley 33 fixedly connected with the upper end of the rotating sleeve 41 through a belt 32.

Preferably, as shown in FIGS. 3-9 , the push mechanism includes: a rotating cylinder 5 , which is rotatably connected to the rotating sleeve 41 ; The eighth gear 444, the inner wall of the rotating cylinder 5 is provided with a track groove, and the track groove includes a first groove 51, a first spiral groove 52, a second groove 53 and a second spiral groove 54 connected end to end in sequence , a connecting rod 4611 is slidably connected to the rotating cylinder 5, a protrusion 4612 is fixedly connected to the track groove on the connecting rod 4611, and a moving ring 461 is fixedly connected to the lower end of the connecting rod 4611; Ring 45 is rotatably connected to the feed pipe 18, and a slide bar 4613 is slidably connected to the connecting ring 45, and the slide bar 4613 is fixedly connected to one end of the moving ring 461; the pushing plate 462 is slidably connected to A moving ring 461, a first spring 463 is installed between the pushing plate 462 and the moving ring 461, a positioning mechanism is arranged between the inner end of the pushing plate 462 and the moving ring 461, the pushing One end of the material plate 462 located on the outside of the moving ring 461 is rotatably connected with a telescopic rod 62; A second spring 63 for pushing the telescopic rod 62 outward is installed between the cylinder 61 and the telescopic rod 62 .

It is worth mentioning that, as shown in FIG. 5 , the inner wall of the telescopic cylinder 61 is provided with a chute 611 , and the top end of the telescopic rod 62 is fixedly connected with a slider 621 slidably connected with the chute 611 .

Preferably, as shown in FIGS. 5 and 6 , the positioning mechanism includes a positioning pin 71 slidably connected to the moving ring 461 and a positioning groove 4621 provided on the pushing plate 462 , and the positioning pin 71 One end of one end is fixedly connected with a positioning block 712, and a third spring 72 for pushing the positioning block 712 into the positioning groove 4621 is installed between the positioning pin 71 and the moving ring 461, and the positioning pin 71 The upper end is fixedly connected with a control rod 711 passing through the upper surface of the moving ring 461 and used to touch the connecting ring 45 .

Preferably, as shown in FIG. 7 , the side of the positioning block 712 facing the positioning groove 4621 is provided with a guide slope.

working principle;

Put the sludge that needs to be discharged into the material tank 21 first, start the motor 15 to drive the first gear 13 and the first screw 11 to rotate, the first gear 13 rotates to drive the second gear 14 to rotate, and then drives the second screw 12 to rotate synchronously, Therefore, utilize the cooperation of the first screw 11 and the second screw 12 to make the screw pump work, suck the sludge from the feed pipe 18, and discharge it from the discharge pipe 19. At the same time, the motor 15 rotates to drive the driving bevel gear 16 to rotate. And then drive the first belt pulley 31 to rotate by the driven bevel gear 17, drive the second belt pulley 33 to rotate under the cooperation of the belt 32, thereby make the rotation sleeve 41 rotate, because the 3rd gear 42 is fixedly connected with the rotation sleeve 41, and the 3rd gear 42 meshes with the inner ring gear 23, so that the pump body 1 rotates around the axis of the trough 21, not only through the feed pipe 18 to fully stir the sludge, but also through the position movement of the feed pipe 18 to avoid the sludge due to low fluidity rather than being sucked away.

At the same time, the rotation of the rotating sleeve 41 drives the stirring rod 43 to follow the rotation, so that the fifth gear 441, the sixth gear 442, and the seventh gear 443 follow the rotation, and then drive the three stirring rods 43 to follow the rotation, so the driven stirring rod 431 is about to enter the feed Stir the sludge in the pipe 18 to break up the agglomerates and avoid clogging. At the same time, pass an appropriate amount of water into the sludge through the flow channel 432, so that the water and the sludge can be more fully mixed, and the flow of the sludge can be improved. performance and reduce water waste.

Because the eighth gear 444 is meshed with the fourth gear 181, the rotating sleeve 41 rotates to drive the rotating cylinder 5 to rotate. Because the sliding rod 4613 and the connecting ring 45 slide and fit, the connecting rod 4611 slides and fits with the rotating cylinder 5, and the telescopic cylinder 61 and The telescopic rod 62 is slidingly fitted, the telescopic cylinder 61 is hinged with the rotary sleeve 41, the telescopic rod 62 is hinged with the pusher plate 462, and the pusher plate 462 is slidably fitted in the moving ring 461, so that when the rotary sleeve 41 rotates, the pusher plate 462 is driven. Following the rotation, since the protrusion 4612 slides and fits with the track groove in the rotating cylinder 5, when the rotating cylinder 5 rotates, the protrusion 4612 enters the first spiral groove 52 from the second groove 53, driving the connecting rod 4611 to rise, At this time, the positioning pin 712 is in the positioning groove 4621 so that the pushing plate 462 and the moving ring 461 are positioned. The pushing plate 462 is directly below the feed pipe 18, and the pushing plate 462 follows and moves upwards, pushing the telescopic rod 62 to overcome the second The spring 63 shrinks into the telescopic cylinder 61, and at the same time, the pusher plate 462 pushes the dirty oil sludge under the feed pipe 18 into the inlet of the feed pipe 18 to avoid the phenomenon of air suction. When the protrusion 4612 enters the first groove 51, The control rod 711 touches the connecting ring 45, overcomes the third spring 72 and pushes the positioning pin 71 to move downward, so that the positioning block 712 withdraws from the positioning groove 4621, and then pushes the telescopic rod 62 to extend under the action of the second spring 63, thereby pushing the pushing The material plate 462 moves outwards along the axial direction of the moving ring 461, and the pushing plate 462 is removed from directly below the feed pipe 18 to avoid affecting its feeding. When the protrusion 4612 enters the second groove 51 from the first When the spiral groove 54, it drives the connecting rod 4611 to descend, and then pushes the moving ring 461 to descend. Since the slide block 621 slides in the chute 611, the telescopic rod 62 pulls the pushing plate 462 to slide along the moving ring 461 when the moving ring 461 descends. When the protrusion 4612 returns to the second groove 53, under the action of the slope of the positioning block 712, the positioning block 712 enters the positioning groove 4621 to form a positioning, and the pushing plate 462 returns directly below the feeding pipe 18, that is, forming Circulation, so that through the continuous rotation of the rotating sleeve 41, the pushing plate 462 can be moved to assist the feeding of the sludge and avoid air suction.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (9)

1. The utility model provides a screw pump, includes the pump body, install the motor on the pump body, the both ends of the pump body are provided with inlet pipe and discharging pipe respectively, its characterized in that, the pump body swivelling joint has the screw rod, just the one end of screw rod wear out the pump body and with the output fixed connection of motor, the screw pump still including set up in the sludge stirring pusher on the pump body, the sludge stirring pusher includes:

the hopper is arranged on the outer side of the pump body and is rotationally connected with the discharging pipe, a trough is fixedly communicated with the lower part of the hopper, and an inner gear ring is fixedly connected to an opening at the upper end of the trough;

the stirring mechanism is arranged on the feeding pipe and is used for fully stirring the dirty oil sludge;

the transmission mechanism is arranged between the motor and the stirring mechanism and is used for driving the stirring mechanism to rotate;

the pushing mechanism is arranged on the stirring mechanism and is used for pushing the sewage sludge to the inlet of the feeding pipe.

2. The screw pump according to claim 1, wherein the screw is divided into a first screw and a second screw which are rotatably connected with the pump body, one end of the first screw penetrates out of the pump body and is fixedly connected with a first gear, the first screw is fixedly connected with the output end of the motor, and one end of the second screw penetrates out of the pump body and is fixedly connected with a second gear meshed with the first gear.

3. The screw pump of claim 1, wherein the stirring mechanism comprises:

the rotary sleeve is rotationally connected to the feeding pipe, and the edge of the lower end of the rotary sleeve is fixedly connected with a third gear meshed with the annular gear;

the stirring rods are rotatably connected to the rotating sleeve and provided with three stirring rods, a flow channel is arranged at the central axis of each stirring rod, and a plurality of stirring rods are arranged on the outer side of each stirring rod, which is positioned on the flow channel;

the fourth gear is fixedly connected to the feeding pipe, a fifth gear, a sixth gear and a seventh gear are meshed with the fourth gear, and the fifth gear, the sixth gear and the seventh gear are respectively and fixedly connected to the three stirring rods.

4. A screw pump according to claim 3, wherein four stirring rods are provided on each stirring rod, and the four stirring rods are distributed in a circumferential array centered on the flow passage.

5. A screw pump according to claim 3, wherein three of the stirring bars are arranged in an equilateral triangle.

6. A screw pump according to claim 3, wherein the transmission mechanism comprises a drive bevel gear fixedly connected with the other output end of the motor, the drive bevel gear is meshed with a driven bevel gear rotationally connected with the pump body, the driven bevel gear is coaxially and fixedly connected with a first belt pulley, and the first belt pulley is connected with a second belt pulley fixedly connected with the upper end of the rotating sleeve through a belt.

7. A screw pump according to claim 3, wherein the pushing mechanism comprises:

the rotary drum is rotationally connected to the rotary sleeve, an eighth gear meshed with the fourth gear is fixedly connected to the rotary drum, a track groove is formed in the inner wall of the rotary drum, the track groove comprises a first groove, a first spiral groove, a second groove and a second spiral groove which are sequentially communicated end to end, a connecting rod is slidingly connected in the rotary drum, a protrusion slidingly connected with the track groove is fixedly connected to the connecting rod, and a moving ring is fixedly connected to the lower end of the connecting rod;

the connecting ring is rotationally connected with the feeding pipe, a sliding rod is connected to the connecting ring in a sliding manner, and the sliding rod is fixedly connected with one end of the movable ring;

the pushing plate is connected to the moving ring in a sliding manner, a first spring is arranged between the pushing plate and the moving ring, a positioning mechanism is arranged between the inner end of the pushing plate and the moving ring, and one end, located on the outer side of the moving ring, of the pushing plate is connected with a telescopic rod in a rotating manner;

the telescopic cylinder is rotationally connected to the rotating sleeve, the telescopic cylinder is in sliding connection with the telescopic rod, and a second spring used for pushing the telescopic rod to move outwards is arranged between the telescopic cylinder and the telescopic rod.

8. The screw pump of claim 7, wherein the positioning mechanism comprises a positioning pin slidingly connected to the moving ring and a positioning groove arranged on the pushing plate, one end of the positioning pin is fixedly connected with a positioning block, a third spring for pushing the positioning block to be clamped into the positioning groove is installed between the positioning pin and the moving ring, and the upper end of the positioning pin is fixedly connected with a control rod penetrating out of the upper surface of the moving ring and used for touching the connecting ring.

9. The screw pump of claim 8, wherein a side of the positioning block facing the positioning groove is provided with a guide slope.

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